Q We have efflorescence on the garage floor. It's in a pattern across the floor to the left and right of minor cracks. We hired a painter, who cleaned and power-washed the floor, treated it with ...

Dear Ken: We have a white, powdery substance on our garage floor. We clean it off, but it comes back. How do we get rid of it? - James Answer: This phenomenon is called efflorescence. Water traveling ...

This article was published 09/02/2013 (4604 days ago), so information in it may no longer be current. QUESTION: My concrete garage floor has a white, powder-like residue all over it. It is especially ...