professional hard water spot and stain cleaner diamond shine 10 ounces hard water stain remover diamond shine diamond shine is a professional hard water spot and stain remover. get the powerful commercial strength that takes stains, spots, rust, out of many different surfaces. remove years of unwanted hard minerals. remove etched in the hard water build-up, scale, and rust. no matter how many years the stains have been building up. diamond shine hard water cleaner completely eliminates and removes the stains, like they were never there. diamond shine hard water cleaner can clean windows, automotive glass, shower doors, chrome fittings, brass components, tiles, porcelain fixtures, bronze, brass, copper, tile, and all surfaces made of aluminum and stainless steel. you can also use it for effective cleaning of your glass stove top, boats, motorcycle, rvs and so much more! our product contains sub-micron diamond dust particles that help it clean and polish all kinds of glass, smooth metals, and porcelain fixtures to a fabulous shine!