Microfiber cloths wringed up in mild sopy water. The tensioner can be picked appart and all shiny metal parts can soak in hot soapy water for they carefully dried and reassebled. I actually don't think tension disks should be affected very much, usually it's enough to just floss with a strip of cloth between them and check that they release when the presser bar lever is up and tighten when down. If you go over with a resin type car polish it will shine up like new. The 401 is not shellac, but a type of oil based paint. Any brownish staining can just as well come from sewing machine oil, and after several decades suprising amounts of grime and dirt will accumulate in any house. Is it in a case or a cabinet?
Last edited by Mickey2; 03-30-2016 at 08:10 AM.