Natural organic salts (no acid) formula instantly removes heavy tarnish without rubbing. Safer than traditional acid-based cleaners. Safe on: glass, aluminum, painted surfaces, fiberglass, stucco, brick, porcelain, brass, and copper. Works great on heavy tarnish, rust and corrosion, calcium deposits and stains, heavy oxidation, and water spots. Just spray and rinse. 400 Sq. Ft. coverage. Environment friendly. Interior/exterior use.