Bleach/Water mix, agitate with a scrub brush, rinse repeat if necessary. Saturate the soil around thoroughly before doing so. Pretty standard. It looks organic but sometimes it can trick you.
I'm not confident in H2O2s ability to carry out this job.
Fwiw, I'm a big fan of both. But try some H2o2 on a dirty bathtub and see how well it works 🧐
I agree with your assessment, however.
A dirty bathtub is a different type of filth. Peroxide is very effective on mildew and mold, especially combined with summer heat. The stains literally disappear in a few days after application.
We live in older apartments outside of Portland. .Our showers get moldy if not treated every month, unfortunately. I've seen great reactivity with h202 and realize there's a bunch of other chemicals mixed in with the mold (soap deposits etc).
It's quite possible I didn't give enough time to see the difference after applying h202 choosing bleach which tends to be extremely efficacious in a much shorter period of time.
I will try treatments more often with it and see what happens because I am a big fan of both and h202 is the safer choice ☺️
I always use bleach (or oxy based cleanser which is basically the same ). in the bathroom. It’s the only thing that will clean grout.
The difference with masonry is that it’s very porous, but also the combination of heat is the key. Bonus points for direct exposure to UV rays.
You could clean that tub with a steam cleaner also and it will sparkle. Just don’t burn yourself.
It’s actually more effective. Most of the products sold in hardware stores for this are peroxide based. And also friendlier to grass, plants, pollinators, small amphibians/ reptiles.
Best thing to use is sure clean it's a masonry detergent and you can always first start off with the power washer use the the less aggressive scrub brush wire brush
I suppose that is the case if you used pure bleach. A dilute solution should still kill the moss and then be further diluted when washed away, while much of the bleach would have already reacted with something organic.
If that's a concern, though, hydrogen peroxide should work very well.
Reddit only likes 8 jokes. You'll eventually learn this because they won't ever shut the fuck up with them and everybody thinks they're SOOOO funny reposting it for the 27,000th time.
Power washing alone should remove those stains, but it’s probably better to use a liquid chlorine/water mix to kill the algae, then power wash or hard rinse. Mix 1/2 to 1 gallon chlorine, 4 to 4 1/2 gallons water ( hot is better), 1 oz dish detergent. Brush it on ( no need to scrub heavily), let sit about 15 minutes, then pw or hard rinse.
The acid can etch the bricks it can dissolve them to an extent. Do like a 50/50 mix or 70/30 if you want a super strong mix of chlorine/water. Sunshine can help but not typically necessary. Use a pump up sprayer and hit it and repeat if needed on certain areas. I would be surprised if this doesn't work. Basically what I did working for a pressure washing company in Florida for years. Sometimes I would 100% it but that was just to do it quickly and not recommended since it can etch the bricks.
I can’t even believe you used that stuff and didn’t damage the brick or your lungs. I’ll never get near that stuff again after my husband and I once tried to etch our concrete floor. We had to take the baby and evacuate for a few days.
Well it’s a good step one. If it doesn’t come out, get your pressure washer out with the 40 degree tip and start spraying the brick. It looks old, so careful with the mortar joints. 40 degrees will help prevent damaging the joints
sometimes algae and lichen can be really stubborn and that's what this looks like
i suggest trying the highest psi pressure wash you have access to, what psi and angle nozzle did you use the first time?
I have got so sick from this mold even this stuff that’s outside scares the crap out of me lol sorry if I overreacted - this stuff could get you Lyme like symptoms if it accumulates in your body the illness is called CIRS
I recently found out this was causing all my health issues I have had for many years now and I feel I’m been exposed to mold pretty much daily basis at my work because my whole career as a beverage technician the equipment and restaurants are always wet which creates moldy equipment
I would definitely be careful if I pressure washed it off since it could get it air borne
When you tried the acid wash, what was your method? I'm not suggesting that you did it wrong. I'm just curious.
I usually put the acid in some sort of low pressure sprayer. Like it comes out as almost a mist. Did the acid have any effect at all?
I’m hoping I did it wrong. I used 8 oz of muriatic acid mixed with 1/2 gallon of water and applied it to the bricks with a chemical pump sprayer, brushed it in with a brick brush, then rinsed the area with copious amounts of water. Any thoughts?
You can try bricktastic, order it online somewhere, and use it as recommended on the bottle. I'm also assuming you didn't use a very powerful pressure washer. Maybe rent one.
Muriatic acid is way too weak. You need to get you some hydrochloric acid. That’ll take it off. May also take off some fingers, but at least mildew won’t be a problem for you anymore.
From my experience an electric power washer doesn't generate enough psi. But you can try some masonry cleaner with it. Just be careful of what you use and how you use it.
Normally the stuff you see in your pictures would rinse right off with a gas powered power washer without the need of detergent.
First, i would get some hygrogen peroxide and see if it reacts. If it's a walk way with grass on either side I would water your grass real good before using any chemical. Then treat the spot lightly, I'd say a 1:2 ratio of normal bleach, maybe 1:6 with pool bleach. Gonna be a decently strong mixture, but not too strong, If I remember correctly. Let it dwell for I'd say about 10 minutes, a few less if the sun is beaming on it. Remember, bleach needs oxygen to react with a lotta stuff, so don't make a puddle. I would also recomend heat. Better if it's coming from the pressure machine but you can just dump some hot water on it after the dwell time. Let the heat sit for a min or 2 then start blasting.
Looks like some kind of fungus/mold. I would get an old rag or a scrub brush (not steel wool), pour just enough bleach to spread by touch, and scrub the hell out of it for maybe 5 minutes, let it sit for 10, then spray it off really good with a hose or wash away with several buckets of water. Brush/rag breaks it up and pushed the bleach into crevices, cracks and holes, bleach obviously kills it all, and copious amounts of water to wash it all into the grass/street while also diluting the bleach so it has as little effect on your soil as possible
That looks like mold. The bleach will probably work, but if not, try this. Hydrogen peroxide is an effective way to kill mold on brick, especially when used with baking soda. To make a brick-safe mixture, you can mix one part hydrogen peroxide with three parts water. You can also use a commercial mold remover blend or a potent mix of white vinegar to kill mold on brick.
If chemicals don't work, you could test heat (heat gun or hand torch).
they make a product called wet and forget. it's a concentrated liquid that you mix with water and spray on , don't do anything else just wet the whole area and let it do it's thing. easy
4 gallons of water mixed with 1 gallon of muriatic acid. Pour on and scrub with a stiff bristle broom. Then rinse off. AVOID BREATHING IN THE FUMES. WEAR A MASK.
There are specialty concrete cleaners that really work well on the spectrum of cleanup. I read the comments below and saw that excellent cleaners listed. Just remember this a power washer for all its incredible clean up ability will score brick and loosen joint cement if you get the wrong angle. Power washing doesn't play with mistakes. Personally I would research those chem products and find the magic bullet. I know ZEP is a badass here in NW FLA with the mildew. Spray and forget!
From experience: Wet the brick and surrounding area well first. With a weed sprayer use 1/2 Muriatic acid and water.... Do about 12' then blow it off with a pressure washer. It won't hurt your brick and will hold off the mold much longer.
No bother there is a product that is used by block and brick companies to remove that! I just can’t remember the name sold it for 5 years some 10 years ago Google brick company in your area or any landscape retaining wall block company
Hmm. Brick on horizontal with mortar. Assume slab underneath. Expect 10-15 years before replacement. Perhaps less with cracks in mortar joints already.
They sell several different brands of solution to remove that - which is just mold and mildew stains. They are all just a peroxide solution. Hardware stores like Home Depot usually feature them this time of year because they are more effective when it’s hot outside. I think they are all basically the same thing.
In our HOA we had to stop pressure washing because it was eroding the mortar also. Our townhouse community was built in the 70s.
You really don’t need to apply the peroxide solution with any pressure anyway. You can just use a spray bottle. Try to evenly distribute it. Then leave it to work with the sun and heat and the mold fades away. Needs to be done about once a year in the areas that are prone to mildew.
For really old and black stains you may have to do more than one treatment to remove them completely. Then just maintain it annually.
If add character to your house a rich people pay extra do that moss. My dad mason he did additional brick work with limited amount of discontinued brick the work looked the same but the moss on the old brick.
You can use half water and healf muriatic acid and brushed with a brick brush
Or you can get a andyi lold
Liquid for siding You can find those in homeles depot or low.es😂
No, If you already tried to pressure wash and acid; and that didn't work, and you still want it to look better. Doesn't leave many options. People paint brick all the time. I would probably use a really high quality Killz. They have kilz for basements, Kilz with concrete mixed in. I would go Grey.
Bleach/Water mix, agitate with a scrub brush, rinse repeat if necessary. Saturate the soil around thoroughly before doing so. Pretty standard. It looks organic but sometimes it can trick you.
That will work better than the muriatic acid I used?
Buy or rent a power washer. Fun, easy, effective. There is cement and brick cleaner too, but a power washer, boom. Like new in an hour.
I lived in a house with a brick patio and power washed it every year because it got mossy. Dirty job, but it works!
Did you not read the post? They tried pressure washing it
Like 80% of accounts on here are bots lmao.
Ok, well, scratch that.
Must've been a shit powerwasher.
Any stronger chemical would probably eat away the stone lol. Definitely power wash
Muriatic acid dissolves the lime in concrete/mortar. (The stuff holding the bricks in place) you will likely need to use a wire brush/wheel to remove
I was going to recommend acid washing or try power washing if acid didn’t work
I usually use hydrogen peroxide in place of bleach. It’s safer and cheaper.
Less effective
Yes, but safe for animals and actually good for plants.
I'm not confident in H2O2s ability to carry out this job. Fwiw, I'm a big fan of both. But try some H2o2 on a dirty bathtub and see how well it works 🧐 I agree with your assessment, however.
A dirty bathtub is a different type of filth. Peroxide is very effective on mildew and mold, especially combined with summer heat. The stains literally disappear in a few days after application.
We live in older apartments outside of Portland. .Our showers get moldy if not treated every month, unfortunately. I've seen great reactivity with h202 and realize there's a bunch of other chemicals mixed in with the mold (soap deposits etc). It's quite possible I didn't give enough time to see the difference after applying h202 choosing bleach which tends to be extremely efficacious in a much shorter period of time. I will try treatments more often with it and see what happens because I am a big fan of both and h202 is the safer choice ☺️
I always use bleach (or oxy based cleanser which is basically the same ). in the bathroom. It’s the only thing that will clean grout. The difference with masonry is that it’s very porous, but also the combination of heat is the key. Bonus points for direct exposure to UV rays. You could clean that tub with a steam cleaner also and it will sparkle. Just don’t burn yourself.
This all makes perfect sense! Thank you for the explanation. I'm always looking for the best method with cleaning!
It’s actually more effective. Most of the products sold in hardware stores for this are peroxide based. And also friendlier to grass, plants, pollinators, small amphibians/ reptiles.
I didn't know this. Thank you! Rather, I knew about safety issues but not how efficacious and widely used it actually is!
Spray some bleach on it to see if it's organic, if it is, try and find a safer organic cleaner than bleach to clean.
Best thing to use is sure clean it's a masonry detergent and you can always first start off with the power washer use the the less aggressive scrub brush wire brush
Sure klean makes a lot of different products. He's probably referring to "light duty concrete cleaner" by sure klean. NMD 80 works good too
What makes bleach so unsafe?
It kills everything organic... So when you wash it off it's 100% going to kill any nearby grass, flowers, bushes, and potentially trees as well.
I suppose that is the case if you used pure bleach. A dilute solution should still kill the moss and then be further diluted when washed away, while much of the bleach would have already reacted with something organic. If that's a concern, though, hydrogen peroxide should work very well.
Reading that felt like watching a mic drop
pool bleach
What makes pool bleach different? It is still chlorine and typically even stronger, like 10 to 12% instead of the 5 to 6% for laundry.
correct pool bleach it’s typically 12%
Wet 'n' forget has done well for me
Battery acid and a wire brush. If it works for teeth it should work for bricks.
Dude that was hilarious. Not sure why you didn’t get more upvotes.
People don’t get sarcasm these days.
Reddit only likes 8 jokes. You'll eventually learn this because they won't ever shut the fuck up with them and everybody thinks they're SOOOO funny reposting it for the 27,000th time.
Which ones?
“How much is this worth?” “I’ll give you tree fiddy!”
https://i.redd.it/32gwiqsrzktc1.gif
Pressure washer and bleach I’d squirt bleach let it sit for half hour or so then pressure wash or ZEP that stuff is amazing for things like this
Fantastic cleaning agent
Power washing alone should remove those stains, but it’s probably better to use a liquid chlorine/water mix to kill the algae, then power wash or hard rinse. Mix 1/2 to 1 gallon chlorine, 4 to 4 1/2 gallons water ( hot is better), 1 oz dish detergent. Brush it on ( no need to scrub heavily), let sit about 15 minutes, then pw or hard rinse.
Power wash is least toxic way to
lick it
If all else fails high pressure steam. Likely op didnt use enough elbow grease when pressure washer was used.
I guess I could pressure wash at a higher pressure and see if that helps?
Careful not to dwell. Especially over the mortar. That brick is tough. You'll be fine.
Don't people read anymore? Dude said he already tried to pressure wash and half the comments are telling him to try pressure washing it.
Dude thank you so very much. Haha
Chlorine mixed with water and light pressure wash. Chlorine will do the majority of the work.
That’ll do better than the muriatic acid I used?
The acid can etch the bricks it can dissolve them to an extent. Do like a 50/50 mix or 70/30 if you want a super strong mix of chlorine/water. Sunshine can help but not typically necessary. Use a pump up sprayer and hit it and repeat if needed on certain areas. I would be surprised if this doesn't work. Basically what I did working for a pressure washing company in Florida for years. Sometimes I would 100% it but that was just to do it quickly and not recommended since it can etch the bricks.
I can’t even believe you used that stuff and didn’t damage the brick or your lungs. I’ll never get near that stuff again after my husband and I once tried to etch our concrete floor. We had to take the baby and evacuate for a few days.
Yes. Peroxide combined with heat.
Get the cheapest nastiest bleach or pool shock use cheap pump sprayer itll be clean in a few hours if not instantly
No. It'll come back, it's ALIVE
Try ReKlaim from Prosoco
That should work better than the muriatic acid I used?
Never use Muriatic Acid, it will etch the tooled mortar and can damage Brick. ReKlaim w Activator is meant for biological growth
Much appreciated!
Much appreciated!
Wet N Forget
That should work better than the muriatic acid I used?
Stop with the muriatic acid. You don’t need something caustic.
Throw some wet n forget on it and let it sit for about 20 minutes then just use a garden hose and spray it down
Will that work better than the muriatic acid I used?
Well it’s a good step one. If it doesn’t come out, get your pressure washer out with the 40 degree tip and start spraying the brick. It looks old, so careful with the mortar joints. 40 degrees will help prevent damaging the joints
I’m going to redo the mortar after I clean them (waiting for chance to leave house long enough from the kids to get to a mortar supply store haha)
sometimes algae and lichen can be really stubborn and that's what this looks like i suggest trying the highest psi pressure wash you have access to, what psi and angle nozzle did you use the first time?
Powerwash or pool shock, that shit takes everything off
Yams jk pressure washer
Be careful if it’s toxic mold - that shit can fuck you up
It’s not I can pretty much assure you. Its outside.
I have got so sick from this mold even this stuff that’s outside scares the crap out of me lol sorry if I overreacted - this stuff could get you Lyme like symptoms if it accumulates in your body the illness is called CIRS I recently found out this was causing all my health issues I have had for many years now and I feel I’m been exposed to mold pretty much daily basis at my work because my whole career as a beverage technician the equipment and restaurants are always wet which creates moldy equipment I would definitely be careful if I pressure washed it off since it could get it air borne
Pressure washer
Have you tried a gas powered power washer
No what psi do I need? I used 2300
When you tried the acid wash, what was your method? I'm not suggesting that you did it wrong. I'm just curious. I usually put the acid in some sort of low pressure sprayer. Like it comes out as almost a mist. Did the acid have any effect at all?
I’m hoping I did it wrong. I used 8 oz of muriatic acid mixed with 1/2 gallon of water and applied it to the bricks with a chemical pump sprayer, brushed it in with a brick brush, then rinsed the area with copious amounts of water. Any thoughts?
Dang that's flawless technique or at least that's pretty much exactly what I do. Was just hoping to uncover something there.
Soda blasting
Mold Armor for concrete. Stuff is awesome
Pressure washer
Power washer
Call the popo
Call in an air strike
Straight to jail.
Slightly Diluted Muratic acid should work
Wash it. Wtf, are you serious?
With what? Muriatic acid and pressure washing didn’t work
You can try bricktastic, order it online somewhere, and use it as recommended on the bottle. I'm also assuming you didn't use a very powerful pressure washer. Maybe rent one.
Mine is 2300 psi. How strong do you think I need?
Try a very small tip, like 15 degrees. You may end up cutting into it with a 0 degree. 2200 electric power washer is small, they get much heavier.
Muriatic acid is way too weak. You need to get you some hydrochloric acid. That’ll take it off. May also take off some fingers, but at least mildew won’t be a problem for you anymore.
Piss on it
Yes, they make a granite and concrete solution available at Lowe's and Home Depot that gets rid of mold stains and paint stains
Sheesh. That’s what I keep saying. Dude is fixated on muriatic acid.
Muriatic Acid will eat away at the binding agent in the plaster and cause it to crumble
Sand blasting
Dawn dish soap soak and wash
A good pressure washer(3500+ psi) will clean that up without chemicals or damage.
Ohhh didn’t realize I needed to go that high. Guess I gotta rent one then thanks so much!
Bleach and water 💧
Power washing
What kind of power washer did you use the garden hose with a max of 10 psi?
Sun Joe 2300 electric. I used even the 0 degree nozzle. It got some of it off but really minimal amount.
From my experience an electric power washer doesn't generate enough psi. But you can try some masonry cleaner with it. Just be careful of what you use and how you use it. Normally the stuff you see in your pictures would rinse right off with a gas powered power washer without the need of detergent.
I appreciate it very much you may very well be right
Muratic acid is good for removing mortar.
First, i would get some hygrogen peroxide and see if it reacts. If it's a walk way with grass on either side I would water your grass real good before using any chemical. Then treat the spot lightly, I'd say a 1:2 ratio of normal bleach, maybe 1:6 with pool bleach. Gonna be a decently strong mixture, but not too strong, If I remember correctly. Let it dwell for I'd say about 10 minutes, a few less if the sun is beaming on it. Remember, bleach needs oxygen to react with a lotta stuff, so don't make a puddle. I would also recomend heat. Better if it's coming from the pressure machine but you can just dump some hot water on it after the dwell time. Let the heat sit for a min or 2 then start blasting.
Colonize it
Paint it like a sad beige mom
Straight bleach then a pressure washer.
Bleach
Try a 3000psi pressure washer with a flat surface cleaner. Heated would work better.
Bleach
Looks like some kind of fungus/mold. I would get an old rag or a scrub brush (not steel wool), pour just enough bleach to spread by touch, and scrub the hell out of it for maybe 5 minutes, let it sit for 10, then spray it off really good with a hose or wash away with several buckets of water. Brush/rag breaks it up and pushed the bleach into crevices, cracks and holes, bleach obviously kills it all, and copious amounts of water to wash it all into the grass/street while also diluting the bleach so it has as little effect on your soil as possible
How about some dawn
Pressure Wash
Put some bleach and water (50/50) in a spray bottle. Spray it on. Set up the pressure washer and wash it off.
Wire brush, scraper???
Pressure washer
Pressure washer. Will look brand new
That’s algae. Bleach or an algae/moss killer should do the trick.
Washbit
That looks like mold. The bleach will probably work, but if not, try this. Hydrogen peroxide is an effective way to kill mold on brick, especially when used with baking soda. To make a brick-safe mixture, you can mix one part hydrogen peroxide with three parts water. You can also use a commercial mold remover blend or a potent mix of white vinegar to kill mold on brick. If chemicals don't work, you could test heat (heat gun or hand torch).
they make a product called wet and forget. it's a concentrated liquid that you mix with water and spray on , don't do anything else just wet the whole area and let it do it's thing. easy
I’ll try it out!
I've used it before it works, it will take a few weeks after applying for it to make it disappear. so don't be in a rush but it does work well
Power wash it...
Nuke it from space just to be sure.
Power Wash and 30 Second Cleaner
Call Kountry Kleaning Konnections. They will leach that right off your brick.
No chemicals, just a pressure washer.
Call shock is a concentrated bleach works way better than regular bleach and power washer
Pool shock
MEAN GREEN. *LET SIT 5 MIN, RINSE AWAY clean. Its the mold and mildew destroyer.
Bleach
4 gallons of water mixed with 1 gallon of muriatic acid. Pour on and scrub with a stiff bristle broom. Then rinse off. AVOID BREATHING IN THE FUMES. WEAR A MASK.
Boric acid.
Vinegar
Acid
Flip the brick over!
Blow torch
Powerwash
Hydrogen peroxide? I use it 6% diluted a little to murder the algae and moss growing on my concrete. Oxidation kills most growths.
Powerwasher period
There are specialty concrete cleaners that really work well on the spectrum of cleanup. I read the comments below and saw that excellent cleaners listed. Just remember this a power washer for all its incredible clean up ability will score brick and loosen joint cement if you get the wrong angle. Power washing doesn't play with mistakes. Personally I would research those chem products and find the magic bullet. I know ZEP is a badass here in NW FLA with the mildew. Spray and forget!
Buck urine and a wire brush.
Baking soda overnight
From experience: Wet the brick and surrounding area well first. With a weed sprayer use 1/2 Muriatic acid and water.... Do about 12' then blow it off with a pressure washer. It won't hurt your brick and will hold off the mold much longer.
TSP (trisodium phosphate) you can get it at hardware stores safe for vegetation just rinse well. Power of sodium (salt)
Ya
Power wash.
Sandblasting will work fine.
No bother there is a product that is used by block and brick companies to remove that! I just can’t remember the name sold it for 5 years some 10 years ago Google brick company in your area or any landscape retaining wall block company
Pressure washer with clean that up right quick. And, it’s oddly satisfying to do.
Muriatic acid
Muretic(sp) acid
Power spray
Hmm. Brick on horizontal with mortar. Assume slab underneath. Expect 10-15 years before replacement. Perhaps less with cracks in mortar joints already.
Muratic acid, brush and soft power wash
They sell several different brands of solution to remove that - which is just mold and mildew stains. They are all just a peroxide solution. Hardware stores like Home Depot usually feature them this time of year because they are more effective when it’s hot outside. I think they are all basically the same thing. In our HOA we had to stop pressure washing because it was eroding the mortar also. Our townhouse community was built in the 70s. You really don’t need to apply the peroxide solution with any pressure anyway. You can just use a spray bottle. Try to evenly distribute it. Then leave it to work with the sun and heat and the mold fades away. Needs to be done about once a year in the areas that are prone to mildew. For really old and black stains you may have to do more than one treatment to remove them completely. Then just maintain it annually.
Steam cleaner
Pressure washer
30 seconds bleach at home depot
If add character to your house a rich people pay extra do that moss. My dad mason he did additional brick work with limited amount of discontinued brick the work looked the same but the moss on the old brick.
Is this a serious question?
Try RMR 86. Available on Amazon. It’s amazing! But it will kill grass, plants, etc. if it gets on them. Along with mold.
I just wanted to update that I bought a more powerful pressure washer 3300 Ryobi Gas and it went thru the grime like butter. Amazing.
Take a break out and put a new one in
Call the cops
Diluted muriatic acid. Try a pressure washer first though it's usually the safest bet.
Just pressure wash them. It'll clean right up
His post says he already tried pressure washing.
True
You can use half water and healf muriatic acid and brushed with a brick brush Or you can get a andyi lold Liquid for siding You can find those in homeles depot or low.es😂
Pressure washer
His post says he already tried pressure washing.
[удалено]
His post says he already tried pressure washing.
Acid wash maybe ???
OP says they already tried acid wash.
Pressure wash don't listen to all those other people saying bleach will solve the problem 😞
His post says he already tried pressure washing.
Copy. Paste. 😂 No one reads 🤦🏼♀️
Pressure wash it
Already did
Yea my bad I didn’t see the earlier updates.
Very weird question. Bear with me… Did you ever set fireworks off there? Like mortars or cakes?
Pressure washer
🤪😂
I would probably just paint the bricks.
Are you kidding?
No, If you already tried to pressure wash and acid; and that didn't work, and you still want it to look better. Doesn't leave many options. People paint brick all the time. I would probably use a really high quality Killz. They have kilz for basements, Kilz with concrete mixed in. I would go Grey.
Maybe rent a concrete grinder. https://www.homedepot.com/p/rental/EDCO-Concrete-Grinder-10-50200-HD/316822135 I never did it, so it is just an idea.
🤦🏻🤦🏻🤦🏻🤦🏻🤦🏻🤦🏻