Ty-D-Bol s Blue in-tank liquid automatically cleans and deodorizes your toilet with a signature blue Clean You Can See! Place the bottle in your toilet tank to provide a constant flow of powerful detergents that will automatically keep your toilet bowl clean between scrubbings. Our Blue Liquid Formula works to fight and prevent hard water stains and make sure your toilet keeps a tidy bowl without harming your plumbing or toilet tank. Keep your toilet stain-free and your bathroom smelling oh-so-fresh with Ty-D-Bol Continuous Blue Water Cleaner!