I was a skeptic of this at first. I had tried a bunch of different products, and I tried scrubbing the mildew away to no avail. I decided to give this a shot. It may be the most amazing thing I have learned as an adult. It works miraculously. here is a photo after 8 hours, all this with absolutely no scrubbing. I put the product on, let it sit, and rinsed it off. It's a must buy