Naturally Green Products No More Graffiti! is a “green” formulated product that is USDA BioPreferred. This product does not contain phosphates or optical brighteners and will work well on most surfaces, porous or flat, containing graffiti. Naturally Green Products No More Graffiti! can be used directly on the surface or with a power washer. Works great in removing parking stains from concrete as well as spray paint on walls, signs etc. Formulated to not remove the reflective coating on way finder signs.