Kaboom NeverScrub for your toilet
I tried this thinking it would be such a great idea - never scrub your toilet again! Wonderful! Turned out quite differently. The dispenser you install in the toilet tank upset the balance somehow and caused the toilet to leak into the bowl constantly. In addition to that, the liquid material that is dissolved and washed into the bowl stained the bowl! Taking the apparatus out restored balance so the toilet stopped leaking, and the stain is slowly disappearing. Our water is high in calcium, which may have had something to do with the staining, but I'm glad I only ordered one for the shipping cost of $4.99.