Tag Off Graffiti Remover from Surco Portable Sanitation Products can be used to remove unsightly marks on portable restrooms, in addition to billboards, bridges, buildings, buses, pavements, road signs, sidewalks, trucks and more. The formulation will not harm aluminum, brass, brick, chrome, concrete, most enameled surfaces, glass, marble, porcelain and steel. It is sold in gallon jugs (four per case), 5-gallon pails or 55-gallon drums. 800-556-0111; www.surco.com.