With the low-pressure wet blasting method, a mixture of air and water and possibly a blasting agent is blasted onto the graffiti. Depending on the surface and type of graffiti, the pressure is adjusted. As a rule, it is between 0.2 and 4 bar. The abrasive varies in hardness and grain size depending on the surface. The graffiti must be blasted from several angles to achieve optimal results. The disadvantage of the method is that components of the plaster are exposed. Also, residues from the spray paints may have penetrated deep into the pores where they cannot be removed by this method. Often, distinct shadows appear on the walls and facades.