A product designed to clean and disinfect toilets is called toilet cleanser. Using the cleaner, scrub the rim and waterline of the toilet bowl. Use a toilet brush to scrub well, then let it sit for the advised amount of time to let the cleaner do its job. To get rid of the cleaner and debris, flush the toilet. Take the required safety precautions, such as wearing gloves and avoiding contact with eyes or skin, and according to the manufacturer's instructions. Keep the cleaner tight and out of children's and animals' reach.