CONCRETE CLEANER & RESTORER is a concentrated blend of inorganic acid and surfactants, formulated to effectively clean and de-stain all types of cement and concrete, porous and non porous surfaces. It can also be used to remove cement residues and grout from hard non porous tiles; however, before application, spot test on surface. Concrete Cleaner and Restorer also removes metal oxides and scale from concrete and metal surfaces, restoring their natural appearance.