Ty-D-Bol's In Toilet Tank Toilet Bowl Tablet automatically cleans and deodorizes your toilet with a signature “Clean You Can See”. Drop the blue toilet tablet in your toilet flushing tank to activate powerful detergents that automatically keep your toilet bowl clean between scrubbings. These toilet cleaning tablets clean toilet bowl stains caused by hard water, leaving the toilet water blue so you know when it's cleaning. When the water is no longer blue, simply add another Ty-D-Bol Blue Tablet and continue to ignore your toilet brush.