Black paint,.............. just kidding but SOS pads seem to get it off quickest or Bar keepers friend.
Oxalic Acid works great...I believe that's the active ingredient in Bar Keeper's Friend.
Mike ------ 1958 Chevy 3200 Fleetside 1958 GMC 100 Wideside ------ Did you get free advice today? To donate to this site using PayPal is fast and EZ. Click here: http://www.stovebolt.com/office/thanks.html