Santeen Toilet Bowl Cleaner is a unique formulation of hydrochloric acid that will remove rust, lime and scale buildup on toilets, humidifiers, water coils, refrigeration units, air conditioners, boilers, lines and valves. Deodorizes and restores toilet bowls to original color. Size: 32 Oz Industrial strength Contains a unique formulation of hydrochloric acid Formulated to dissolve heavy accumulations of lime, rust & scale from toilet bowl tanks, jets & rim holes of toilet Deodorizes & restores toilet bowls to original color Can be used on china urinals, pumps, humidifiers & fiberglass boats.