Glenn, I've had great success with this stuff: "<span style="font-weight: bold">3M Mag & Aluminum Polish</span>". It's parts # 051131.
I use it on practically all metals, including the annodized windscreen surround on my Midget. It also rendered my SU carbs looking like new - not all shiny, but very clean and semi-gloss looking.
It takes a bit of rubbing, and the oxidation comes off a black color on the cloth. It results in a very nice, clean surface that actually has a wax-like protective coating afterward. It works on any non-coated metal.
I got mine at K-Mart or AutoZone, I think. 10 oz. can cost about $10, and it goes a long way.
Give it a shot. Good stuff.