Cleaning Concrete

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Old 10-03-19, 04:04 AM
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Cleaning Concrete

A basic question. I want to clean the concrete walkway out front. I took a picture of the steps.

1) What causes this? What is the staining? The walkway isn't that old.

2) How to clean? I already tried scrubbing using a deck brush and bleach mix, with no effect. What is next? TSP? Acid? Other product? There are grass and plants in the area, and adjacent vinyl siding in some spots. Also, I only have an electric (lower psi) pressure washer.

3) If removed, what can I do to prevent/delay the return of the staining?

Thanks.
 
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Old 10-03-19, 04:30 AM
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If the concrete isn't that old then it could be the color concrete goes through as it cures. Eventually it should end up a very light gray.
 
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Old 10-03-19, 04:35 AM
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Whoops, let me clarify... the concrete is 5-10 years old, and has looked like that for a while. Curing is not the issue. I just meant that the concrete isn't 30-40-50+ years old. Thanks.
 
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Old 10-03-19, 04:40 AM
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It's just weathering. Nothing wrong with it. It will happen with all concrete depending what kind of environment it sees. I have a section of concrete that gets covered in leaves during fall. The leaves have let permanent stains on the surface.

You can gently use a power washer on it to remove the surface "skin" then use a sealer.
 
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Old 10-03-19, 05:04 AM
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It's just weathering. Nothing wrong with it
Yes, I have seen this type of staining before, but wasn't sure if it was mold/mildew kind of issue. This cement only sees limited direct sun.

You can gently use a power washer on it to remove the surface "skin" then use a sealer.
The pressure washer is electric, and I think is only 1800-2000 psi.

Is there a detergent or cleaner I should be using, or is the the cleaning process merely a matter of removing the stained layer?

What sealers are recommended or have good reputations? Thanks
 
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Old 10-03-19, 06:26 AM
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You can gently use a power washer on it to remove the surface "skin"
For steps this wont work but for any other large flat surfaces invest in a power washer plate cleaner, they do a fantastic job and you will eliminate the uneven cleaning of using a single tip.

Just google and look at the videos, they are that impressive!

BTY, that is perfectly normal discoloration! I dont think the time, effort, expense of chemicals or sealers is going to provide any long term benefit!
 
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Old 10-03-19, 11:39 AM
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I've used bleach to lighten up old concrete, don't know how effective that would be on yours.
 
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