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Before I would use an acid cleaner, I would try a Hot pressure washer like a Hot Z or similar with a mild cleaner like Simple Green first. Then go to the acids cleaners if needed. I clean my brick walkways every couple of years. I bought 2 gallons of muriatic acid to use. The pressure washer alone did a great job. Still have the acid.
BE very careful with the acids if you decide to go that route or hire a professional.
(good reason to buy a pressure washer)
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Dave K
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