Magnum is a safe and effective aluminum brightener that is non-corrosive except to aluminum. Its high foaming concentrated formula makes it foam onto surfaces extremely easy and safe. It clings to the aluminum surface to provide maximum dwell time to reduce amount of scrubbing. Magnum is safe on vehicle rims and chrome and is 100% biodegradable and environmentally friendly. It is also 100% ammonium difluoride free.