Calcium, lime and rust remover concentrate dissolves tough limescale, rust and hardwater stains. Fast and effective: powerful formula for use on a broad range of application and on stainless steel and chrome fixtures such as tubs, sinks, kitchen faucets and humidifiers, dishwashers, washing machines and shower head. Surfaces of use: glass, porcelain, fiberglass, brick, cement, stucco, copper and PVC pipes and other equipment such as steam tables. Usage directions: apply solution directly to stain using brush, cloth, sponge or pad (do not leave solution on stain for longer than 2-minutes) then rinse with water, no scrubbing required for light stains: use equal amounts calcium, lime and rust remover concentrate and water. For heavy stains: use at full strength. For steam tables: use 1.5 oz. of calcium, lime and rust remover concentrate with 1-gallon of water.