Looking good Jim, when I polish my copper lamps I use 00 steel wool, followed by 0000, then some Flitz on a rag, makes for a great shiny finish. Though you can only really do so much polishing on something that only you're going to see when you open the machine to stock it. Though it is satisfying to see it when you do!
You make a good point Tom. I'm at the point now where the copper is "good enough" for me and I've removed or neutralized any rust on the unit. I'm not planning at this point to do a full restoration on the cabinet, it is a nice survivor, so it makes little sense to go really over the top with the cooling deck. The copper is mostly shiny but still has tarnish in some of the crevices. I hit it with 000 steel wool first to get most of the really bad oxidation off it then used the vinegar/flour/salt paste to get it a little better.
Next stop - grinding away all the old rust in the bottom of the cabinet. A nice clean cooling unit needs a clean home. I'm going to have to cut and drill out the blobs of rust that used to be the feet for this thing.
Jim