During a walkway pour some concrete residue smeared on the existing landing pad and entrance (both old concrete) causing a dirty appearance.
Is there a way of cleaning a smear of concrete from old concrete slab underneath?
Concrete – How to clean cement smear from concrete
cleaningconcrete
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Best Answer
A pressure/power washer will help the old concrete look new. Typically, a 3000 PSI or greater power washer is used on concrete. I have one not quite that powerful, but I used a narrow angle on the sprayer and my driveway came out looking many years newer as well as knocked off loose concrete which I think would help you resolve this problem.