Powerful, trusted multi-use cleaner dissolves even the hardest calcium and lime buildup, rust, mineral deposits, hard water stains, soap scum, and oxidation. Certified EPA’s Safer Choice for safer chemistry means that this non-toxic formula is safe for use in a wide variety of applications including dishwashers, coffeepots, sinks, toilets, glass, siding, stucco, sprinkler systems and more! CLR PRO Calcium, Lime and Rust Remover is NSF Certified and is approved for use in food processing, food storage, and food service facilities. Plumbing and septic safe. Phosphate-, bleach-, ammonia- and alcohol-free.