CLR 28 oz. Calcium, Lime & Rust Remover is a powerful industrial-strength cleaner designed to eliminate calcium, lime, and rust deposits from a variety of surfaces. It effectively removes tough scales and discoloration from porcelain, chrome, glassware, grout, and more. Ideal for use on bathtubs, toilet bowls, sinks, glass, chrome, fiberglass, stainless steel, coffee makers, humidifiers, dishwashers, washing machines, and showerheads, it also works well on RVs and boats. This versatile formula dissolves and removes deposits quickly and easily. CLR is part of the EPA's Safer Choice Program, containing no phosphates and being septic-safe.