Paul, With care and patience, you can make the 500-C shine, especially the tube shields and capacitors. It looks in fine shape now with just a coating of dust and no stains or spills. Just go very gently on the cadmium-coated chassis, without using any abrasives. You can even make the tuning flywheel gleam, although not as bright as the one on the 500-B. My 500-C looked just like yours before I cleaned it.