I have several white English saddle pads that have gotten really funky on the underside and a few have mildew spots from getting wet and setting in my car over night. I tried soaking them in vinegar and then washing in the super cycle but they come out looking the same. Any ideas or tricks to getting them clean other than bleach? I was thinking maybe some type of foaming cleaner that hooks to a hose and using a pressure washer maybe????