Studies show the faster graffiti is removed, the less likely it is to return to that same location. If a contractor covers an area that tends to receive a lot graffiti, someone or a crew might need to be assigned to routine graffiti removal for the fastest results. This also avoids pulling cleaners from regular duties. The Wall Graffiti, an Austin, Texas-based company specifically dedicated to graffiti removal. This might seem like an obvious rule, but by leaving any marks, you are simply encouraging the tagger to strike again, he says.
Removal efforts vary according to the medium used.
Middle schools or high schools where magic-marker graffiti often occurs can use specially formulated solvents. For painted surfaces, the removal method of choice is re-painting. In heavy graffiti areas, Ron Bruneck, vice president of Superior Pressure Washing, Inc., in Santa Ana, California, recommends re-painting using one color. If we tried to block out graffiti using different colors, soon alleyways or buildings would look like a checkerboard with colors that are impossible to match. So we try to get the owners' permission to paint the whole alley or building in the same color.