Sorry. I've never heard of it used on commercial fabrics for anything but stain removal. I would assume the fabric has to be wet in order to activate the salt. Try sprinkling some kosher or sea salt on your fabric and misting it with water. You should be able to see results if it's going to work. The reason it works with the paints is because they have not yet been heat set. The dyes in commercial fabrics are well set before you buy it.