For years I have been struggling with thw really youch stains in our bathroom, that I had reached the point of desperation . Then after seeing the harpic bleach ad, I decidrd to buy it, and try to remove the stains, but I did not do its job, and the stains were there as it was, with no change. I literally used half a bottle, let it soak scrubbed, till my hands hurt, but no results. it was just good money down the drain literally.