Rust-Oleum Whink Calcium Lime Remover, 16 oz. is a powerful liquid formula designed to quickly dissolve lime scale, calcium stains, and hard water buildup on a variety of surfaces. This professional-strength, non-abrasive cleaner effectively removes unsightly buildup without the need for scrubbing, making chrome, glass, and fiberglass surfaces look new again. It is i for use on bathtubs, showers, sinks, toilets, shower doors, tile, and fiberglass, and is safe for septic systems. Additionally, it works on humidifiers and vaporizers to dissolve lime buildup, helping them operate efficiently. Model Number: 35216