Pros know that acids are required to dissolve soils, hard water buildup and rust in toilets. This 32 oz. Zep professional grade acidic formula clings longer to remove stains and discoloration with less scrubbing. Deodorizes and leaves a fresh winter green fragrance. This pro-strength acidic gel can be used on toilet bowls and urinals to clean stains, deodorize, and disinfect.