Mr. Hard Water CMET - 1032 Metal Cleaner Biodegradable, Non-Toxic, safe, and easy-to-use,Run-Off safe For use with a pressure washer or by hand Removes calcium and rust stains from metal, stainless steel, aluminum, pool tile railings and other metal surfaces Safe on rubber, fiberglass, plastic, and porcelain, Safe to the skin Use full strength or dilute, Concentrate: makes 2 gallons. Dilute 8:1.add 1/2 qtr. To1 gallon of water Biodegradable, Non-Toxic, safe, and easy-to-use,Run-Off safe Removes calcium and rust stains from metal, stainless steel, aluminum, pool tile railings and other metal surfaces Safe on rubber, fiberglass, plastic, and porcelain, Safe to the skin Use full strength or dilute, Concentrate: makes 2 gallons. Dilute 8:1.add 1/2 qtr. To1 gallon of water