Water-based biodegradable formula. PH 12.5 - 13.0. Removes tough stubborn stains & soils such as grease oil sludge soot ink coffee and more. Does not contain chlorinated or petroleum solvents bleach ammonia abrasives or butyl. Contains rust and corrosive inhibitor to prevent flash rusting of metal surfaces. Safe on all surfaces except magnesium. Nonflammable