Calcium, Lime and Rust Remover features a powerful formula that quickly and easily dissolves and removes tough calcium and lime deposits as well as surface rust stains. Versatile formula cleans plastic, ceramic tile, glass, stainless steel, faucet/shower fixtures, shower doors, fiberglass, sinks and more. Calcium, lime and rust remover is part of the EPA's Safer Choice Program recognizing the product as a safer alternative to chemicals. Fast-acting, powerful formula is septic-safe and contains no phosphates.