I'm sure we all know what a hassle filtration soil can be. I've always tried to get it up as best I can, and usually end up with a "that's permanent" look on my face. I just looked up a product called FSR, or filtration soil remover. As the name suggests its should rid of us filtration soiling. Just wanted to know if anyone has tried this product or anything similar, claiming to remove filtration soiling. Any tips on how to take out filtration soiling without buying these specialized products?