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Are you new to graffiti removal? To get consistent results with your equipment, begin each job with a small test area to make sure the masonry can stand up to sandblasting before you start. Many modern buildings have dyes in their masonry; some are "integrally dyed", while others have only a surface coating which bleaches out easily. Because buildings are often built with a mixture of materials, streaking and discoloration during graffiti removal is always possible. Cleaning a small test area will help you determine what method of graffiti removal will give the best results.