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red chaulk has a red dye in it - it will be there for years. use blue instead. red is good for layout on subfloors, but NEVER on a finished product I have removed some stains from concrete with a pressure washer, but red chalk is a tough one, the best I can do for you is give you this site: * http://www.browns-services.com/decorative_care.php

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17y ago

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