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If you're using a pressure washer for graffiti removal, it's a good idea to start off with a test area to make sure you're using the appropriate amount of pressure and prevent further damage to the marked surface. Use a wide spray pattern to avoid etching any paint into the wall or area you're cleaning. You have to be especially careful with older masonry surfaces that are prone to crumbling. Make adjustments as you go until you find the right pace and pressure setting to remove the paint.