Urine stone & Drain Whitening Cleanser Easy to work in small place of toilet bowl, vertical plane, corners. Gel type with viscosity that can keep the reaction time long enough to maintain best cleaning quality. Very good indoor workability due to almost no smell and easily removes contaminants such as toilet stones, rust and stains. Apply evenly to the surface of material and rub it with sponge, scrubber or brush after 5 minutes of reaction time If stains are so massive, secure the reaction time for 5-10 minutes and then work. Wash with clean water after work