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Old 05-12-2009, 09:28 AM   #1
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Pressure washing concrete


What can I use along with the water to clean off any loose paint, green matter, staining on my concrete steps? Looking to not layout a ton of money on fancy chemicals.

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Old 05-12-2009, 06:51 PM   #2
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Pressure washing concrete


You may not need any chemicals; try water alone and see if it comes off to your liking. If not, stores have lots of stuff to buy.

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Old 05-12-2009, 06:58 PM   #3
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Pressure washing concrete


I've been using just a power washer on my concrete pool deck
I think its a 2500 psi model - runs off gas
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Old 05-13-2009, 09:21 AM   #4
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Pressure washing concrete


Just water can work pretty good. For stains on concrete I have had good success using a cheap powered laundry detergent mixed with water to make a paste. I will scrub this on any stains then keep it wet by spraying it once in a while or cover it with a plastic tarp for a few hours. For green (alge or vegetation) stains mix a little bleach in. I have had stains from oak leaves that never went away... It must be something unique to that particular leaf.

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Old 05-13-2009, 05:37 PM   #5
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Pressure washing concrete


Yeah, leaf stains are really tough. I think a bleach/chlorine solution strong enough to oxidize them will likely kill any plants nearby from runoff.
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Old 05-14-2009, 10:13 AM   #6
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Pressure washing concrete


It's the oak leaves that I could not get off with bleach or hydrogen peroxide (oxy clean). Someone told me it was tannic acid in oak leaves that cause the stain on cement. I do not know if that is true but I can tell you the oak leaf stains in driveway were there atleast two years and might still be... I moved so I don't really know.

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Old 05-14-2009, 05:14 PM   #7
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Pressure washing concrete


I use some pool chlorine and water mix but that isn't too good for vegetation and it seems to work fairly well but there is still a ghost image. I may do some googling for a better remedy; if I find anything I'll post it.
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Old 05-15-2009, 06:08 AM   #8
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Pressure washing concrete


Rent a good power washer - try it, see what's left (if anything) then go from there.

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