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When dealing with graffiti removal, it's best to direct the spray of your pressure washer at a steep angle towards the surface you are cleaning. In other words, you must have your spray wand up close to the wall. This helps chip away at the graffiti and remove it in a peeling action. Refrain from spraying the surface straight on, as this may simply imbed the graffiti into the surface.
|Jennifer Mathes, Ph.D.|