text: why is toiletbowl cleaner with bleach blue?shouldn't the bleach take the blue out?does it work on blue stains?   yeah, and why doesn't blue laundry detergent stain your clothes? i'm not sure of the answers, but i'll bet it's a chemistry issue. never put a chlorine toilet bowl cleaner into the water tank. yeah, it helps keep the bowl clean but it destroys the rubber plumbing fixtures inside the tank which leads to leaks and huge water bills.  just scrub the toilet manually every six to eight months.