The use of the wrong graffiti remover can leave surfaces, particularly natural stones, looking worse than before. It also result in higher costs. The most common damages are persistent graffiti shadows.
Many graffiti removal efforts done unprofessionally aren't successful and leave on the facades very visible traces of the failed attempts. The most common damages are color graffiti shadows or peeling of the paint after painting over the graffiti or blasting damages while removing graffiti.
While blasting, hot water high pressure or steam cleaning are effective, they can also trigger further damages if used improperly, especially when the intensity of the stream is too high. In the worst case holes are made in the facade, leading to further deterioration and higher repair costs.