Grout Off is a special blend of acids and detergents specifically formulated to remove grout and mortar residues from porous and non-porous surfaces. Unlike conventional hazardous acids, Grout Off is designed for safety when cleaning. Grout Off contains inhibitors to prevent fumes from attacking metal components associated with buildings. Grout Off powerful formula makes it cost effective when diluted.Grout off will not remove grouting that has been mixed with bonding liquid.