Thanks for a great product ! After 3 years of non-use, I was so discouraged at the scale in what were brand new toilets. I had previously tried CLR, dabbing the liquid on to the ring, letting it soak and then using an electric toothbrush. No progress. Knowing how disheartened I was, my husband took it on himself to try to clean the toilets. Only this time, he decided to try Cling N Clean. After 4-5 applications with just a little scrubbing to ensure full coverage of the liquid ....... our toilets are like new ! I cannot recommend this product enough !