Our toilet cleaning tablets contain sodium bicarbonate, citric acid and sodium hypochlorite. It can quickly remove stubborn dirt. Go deep into the pipe and clean it thoroughly. Its use method is very simple: 1. Take an effervescent tablet and put it in the toilet; 2. Let it sit for 3 minutes to completely dissolve, then use a toilet brush for basic cleaning. 3. Press the toilet switch to flush and clean. Effectively clean the surface and interior of the toilet, and make the toilet look new.