Always keep the toilet lid down if you use toilet bowl cleaners. (cspca.com)
It's a continuous toilet cleaning system that attaches easily out of sight within your toilet tank and provides powerful stain toilet bowl cleaning continuously for up to 3 months. (thefashionablehousewife.com)
A coloured toilet bowl cleaner, which changes the water from clear to colour, can serve as an entertaining reminder. (bounty.com)