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Removing freelance artwork and remarks from a municipalities public concrete surfaces is a never-ending process. The best option for this type of surface is to power-wash the graffiti with a 3000psi-pressure washer. Be careful in selecting the type of tip you use in the pressure wand. Too narrow of a tip (such as 0 degree) will etch the masonry surface leaving a perfect outline of the graffiti removed, which only creates another eyesore.