OK where to start... A friend of mine bought a "fixer-upper" house and I went to help her clean. The toilet appeared to have mildew in it so I threw in some bleach and started scrubbing, nothing happened. I tried everything, even some stupid driveway cleaner, the stuff didn't budge. So we decided to add a new toilet to the list of things to buy for the house. Well I went to Wal-Mart later that day for some dish soap for home and saw this "Oxi-Clean Bucket". Inside it was a bottle of Kaboom. It was a great deal on the bucket and I could use everything at home, plus some things i hadn't tried, so I bought it. I took the Kaboom with me the next day. I sprayed down that stupid toilet and went to find a Brillo pad, when I came back about 2 minutes later, the toilet bowl was white!!! Oh, yea. No black mildew, no rusty ring. It was as white as a new one! I thought, no way this just happened. Someone switched toilets on me, or I walked in the wrong bathroom. I yelled for my friend and she stood there staring in amazement and them burst out in tearful laughter! I couldn't believe it, some days I still don't. And if Billy Mays ever decides to quit pitching it, I will take that job for free. This stuff is awesome and unbelievable.