Steel wool?

I'd be using medium or slightly coarser steel wool with a chrome polish, or Brasso, some sort of aggressive polish and start out with light hand pressure and progressively lay into it, doubtful you will dig into the steel, if that works then go to a finer polish w/fine steel wool. Gotta break through that hard baked layer first and get to the metal to then polish. Your hand and arm will fall off trying to lightly polish through that otherwise