A+PLUS™ Hardwater Stain Remover™ contains a uniquely engineered abrasive that greatly speeds cleaning and restoration of most surfaces, including glass, metals, and porcelains. Removes and cleans mineral deposits, acid rain, cement leaching, silica, screen burn, soap scum, oxidation, scale, lime, corrosion, chalking, and rust. A+PLUS is the answer for glass restoration, both interior and exterior, and can safely be used on glass, ceramics, and metals. It contains no harmful chemicals and rinses away cleanly. It’s environmentally friendly and contains zero VOCs.