It's a bit late now, but some polished are very effective on the shiny parts; needle and presser bar shine up like new with something called Quick-Glo, in just a few minutes with hands, a cotton rag dipped in a bit of the paste; rust, grime and tarnish comes very effectively. Paste type polishes seem to be more effective than thinner liquids, at least the stuff I have tried. Pol and Autosol work well too, I'm sure there are several, and it's worth tracking down the brands that work well for steel and chrome. I have yet to pick a machine completely appart, I hope to avoid it, but once off I guess the cast iron rods and hinges clean up much easier too.