Had a spot on my white bathtub from coloring my hair. Ising comet and water did not remove it. I had recently been given a gallon of a cleaner that a neighbor who was moving claimed was "the best cleaner on the market". Then, I tried a cleaner that I was sent from a company that send you samples to report on. They faded the spot some, but it was still there. Then I sprayed some Whip-It® on the spot, saturated a piece of white paper towel with some more Whip-It® and left it. I came back a little later, gave the towel a quick rub, removed it and YEAHHH - the spot was TOTALLY GONE!