Recently I asked a question about how best to brighten brick on an old fireplace and now have a good database on that subject. But now I would like to know how to brighten dingy, smoke-discolored mortar, which may require a different approach (??) I have tried the standard, non-reactive cleaners and they don't work. I have also heard that muriatic or phosphoric acid solutions may work, but I wanted to consult the experts before trying anything. Could someone set me straight on this? (Whatever is suggested, I am prepared to take all necessary safety precautions, but I want to avoid "wimpy!") Thank you for your help. Frank
- posted
17 years ago