Zep Professional strength Acidic Gel Toilet Bowl Cleaner, 32 fl oz Description: Zep Toilet Bowl Cleaner quickly removes rust, dissolves organic stains, and eliminates hard water residue from toilets and urinals. Its powerful 10 percent acid gel formula enables the cleaner to tackle even the most stubborn of stains. The thick gel clings to vertical surfaces, while its squirt top makes for an easy under-the-rim application. The formula's fresh wintergreen scent eliminates the harsh odor associated with most cleansers. About Item: Special clinging formula provides extended contact time to remove rust, stains, scale and residue. Will not harm septic tanks or drain lines. Professional cleaning with less scrubbing. Built-in squirt top makes under-the-rim application easy. Suited for use on toilets and urinals.