Wash Safe Industries WS-RO-1G Clear Rust Off Rust and Hard Water Stain Remover, 1 gal Bottle with Spray Attachment Rust Off removes rust stains from most any surface in sands! Just spray and watch as the rust stains disappear! Rust Off removes rust from Tools, Concrete, Fishing gear, Automobiles/Cars, Boats, Engine parts, Toilets/tubs, Bikes, Motorcycles and much more Rust Off can also be used to penetrate and loosen rusted nuts, screws, and bolts Works equally as well on other mineral stains including iron, calcium and lime Rust Off is used by Welders, Painters, Mechanics, Home Owners, Fishermen, Maintenance Personnel, Auto Restorers and more