Several weeks ago I answered a letter in this column concerning removing hard water scale build up in plumbing supply pipes using muriatic acid and potassium permanganate. I discouraged the practice, ...

Q: My concrete sidewalk and driveway have large brown rust stains that I haven’t been able to remove. I tried bleach and a chemical remover to no avail. Can you help? A: Rust stains on concrete seem ...

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Q. My driveway has unsightly rust stains, which I have tried to remove with standard driveway cleaners without success. Do you know of a cleaning method that would remove these stains? A. Mild rust ...