Barkeepers friend is one of the few cleaners that I use on my All Clad cookware. It's one of the few cleaners that won't damage expensive cook ware AND removes polymerized oil. I also use it to clean my stainless exhaust tips on my GTO. You can find it anywhere, even Walmart here in Mexico carries it. I just buy the powdered stuff and mix it with water to make a paste. I actually got rid of other cleaners and instructed our cleaning lady to only use BKF, since another cleaning person used a freaking brillo pad on one of our All Clad lids and scratched it all to Heck. If you have Stainless steel whatever you need to be using BKF, it's also awesome on chrome plumbing fixutes that get spotted with hard water.