Since 2001, I have been a huge fan of EdFred’s Kling n’ Clean toilet bowl cleaner. I was having a party and had tried everything to clean the calcium and lime deposit ring around my toilets. A few days before a party, I decided I would remove the rings with a scouring pad, but that did nothing but add black marks to the ring. I asked a co worker what she used, since I never heard her complaining about this problem with her toilets. She just smiled and told me she would bring me the solution tomorrow. True to her word, she brought me a bottle of EdFred. I went home that evening, followed the directions, and could not believe that with a swish of the toilet brush the calcium and lime ring stains were gone. I have not used anything else since. Thank you for your amazing products!