Eliminates grout haze, efflorescence, lime deposits and hard water stains. Removes soap scum, rust stains, paint, and construction dirt. Use indoors and outdoors on floors, walls, shower stalls, bathroom fixtures and facades. Safe on acid resistant stone, porcelain, ceramic tile, brick and terracotta. Ideal For: Porcelain Tile, Ceramic Tile, Terracotta, Acid Resistant Stone. Advantages: Eco-friendly: Does Not Emit Fumes That Are Harmful To People Or The Environment. A Welcome Alternative To Muriatic Acid. Does Not Alter The Color Of The Material. Does Not Damage Or Corrode Aluminum And Steel Trims When Used Properly. Can Be Used As A Cleaner Or Limescale Remover, Based On The Dilution.Biodegradable.