A strongly acidic, solvent free de-scaler designed to dissolve hard water deposits on acid resistant fixtures and fittings in bathrooms and washrooms. Where to use On all acid resistant substrates, for the treatment and removal of hard water and scale deposits. WASHROOM DESCALER rejuvenates most durable surfaces around the house. It cleans and removes unsightly limescale stains and watermarks, leaving a bright shiny surface. Will prevent the build up of limescale and dirt.