Our toilet cleaning block contains lemon extract, disodium EDTA, and sodium bicarbonate. It can provide a long-lasting fresh scent that keeps the bathroom fresh at all times. Decontamination formula, can effectively remove dirt and odor in the toilet. Its use method is very simple: 1. Take a piece of this product and put it in the toilet tank. Over time, this product will slowly dissolve. 2. After each use of the toilet, press the flush switch to clean the toilet. The cleaning effect can last for three months, keep clean for a long time, and improve the bathroom environment.