Remove cement off paving stones with muriatic acid.
November 16, 2005
Q: I have a dual driveway with uni-decor paving stones. When the neighbour had his garage stuccoed the firm that did it did not put a sheet under the mixer, and spilled some cement on my side. He quickly rinsed it off but it left quite a bit and the grey cement looks terrible on the stones. Is there a way to remove this?
A: Clean the concrete with muriatic acid (60% acid to 40% water). Caution: Mix the acid into the water and always wear proper rubber boots and gloves as well as eye protection anytime you are working with acid. Apply the mixture to the surface by means of a plastic watering can. Wait 5 – 10 minutes and scrub with a stiff brush. Rinse off well letting the water flow into a grassy area. Allow the area to dry and seal with Aqua-Seal available from Cloverdale Paint. To apply puddle the sealer onto the surface and spread with a brush or roller. Do not apply the sealer in the sunshine. For best looking results you may want to do the entire paving stone area.