After trying numerous toilet bowl cleaners on the market I have found that Kaboom has the very best! I find that it cleans hard water stains and anything else with ease. I just pour some of the liquid around the surface of the toilet bowl, being sure to aim the dispensere up into the bowl rim. Then I allow it to sit for approximately five minutes, then scrub with a toilet brush. It leaves the bowl sparkling clean with very little effort or brushing. I do not like the idea of leaving a cleaner in the bowl or tank all the time, so for me this is the best option. It is very affordable and you only need a small amount of the liquid per use, so that keeps the price per use even lower. The package says to wait for the purple liquid to turn green, but I have waited upwards of twenty to thirty minutes and have not seen this color change happen. I also use this liquid to remove rust stains. The package does NOT list this as a use, so please try this use with caution.
Port Charlotte, FL