I live in a very humid environment. I purchased a very expensive suit-jacket and slacks. Went to put on the jacket and thought I had paint spots on the edge, but found out from the cleaners that it was mold/mildew. They treated it and it was back in two weeks. I tried a number of products to resolve the problem. Then I found your product on-line and sprayed a small amount on the jacket and prayed. Next day, it was totally gone, but back in smaller amounts a few weeks later. Sprayed it again – the bonus was the product smells fresh, not horrid! It went away and has not come back. I still spray that one pocket every 3-4 months just in case. It is black, by the way, and no color problems at all from your product. I also sprayed the walls of my closet three times, a week apart, and no more black spots.