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If you are starting a graffiti removal business, the surface you are cleaning dictates how to proceed. Concrete brick and simulated stone often look like clay brick and natural stone, but will require different methods of graffiti removal. The key to successful sandblasting is using the portable sandblaster on surfaces durable enough to withstand the work. Concrete brick and simulated stone are simply not tough enough.When you do use the sandblaster, avoid the mortar joints to prevent damage to the structure.