Water-based biodegradable formula. PH 12.5 - 13.0. Removes tough, stubborn stains and 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.