Continuous cleaning action with every flush. Deodorizes with every flush. Lasts up to 400 flushes. With each flush, water flows through the holder, releasing a concentrated cleanser that works to continuously help clean and deodorize your toilet. Cling Clip-On Toilet Bowl Deodorizer & Cleaner, from the Lysol Brand the Toilet Cleaner Expert, leaves a pleasant scent, keeping your bathroom smelling fresh and clean - day in and day out.