If it is the metal bezel portion, rubbing alcohol on a rag should clean that up with ease.
:I have a neat Philco 37-610 wooden radio. It has a nice multiband dial but much of it is heavily yellowed from residual nicotine..I would like to remove the nicotine but am afraid the dial markings will come off too..anyone know how to get the nicotine off without removing the dial markings? Thanks