This helps eliminate hard water stains, rust, and limescale from things like shower doors, shower stalls, shower glass, windshields, windows, glass, barbecues, chrome, tile, toilets, granite, steel, fiberglass, pools, bath tubs, sinks, granite, marble, chrome, boats, autos, brass, stone, metals, porcelain, brass, aluminum, stainless steel, hard vinyl, and more!
Promising review: "When we moved into our new place the shower doors looked like they had never been cleaned before. I tried at least 10 different products and methods to remove the hard water spots but nothing even made a dent. Bio Clean, however, was like a magic eraser! I scrubbed each door for about 10 minutes and it was incredible! I’ve never written a cleaning product review before but this one is worth every penny." —Shane B
Get it from Amazon for $19.97.