I have been battling hard water stains in my toilets for the past.20+ years and I wish I had purchased this sooner! What it has not done, though, is remove any build up that is already there. If you just installed a new toilet BE SURE YOU BUY THIS! if your toilet already has build up or stains, know you need to scrub it off just one more time - then you will never have to do it again! WORTH EVERY PENNY even if it isn't on sale! Thank you, Krazy Klean!
Krazy Klean has really worked for my household. I definitely recommend trying it.
The ten year Warranty is pretty unbelievable. Not sure I’ll still be around then but it did help sell me!