The camper is actually between 1947 -1950 something, so I just assume there is about 65-70 years worth of oxidation on the skin. Its never been polished to my knowledge and its never been garage kept until recently.
So how the hell do you polish a turd? Well, its gonna be messy and your hands are gonna be covered in stuff that smells bad. I tried 3 different products to get Wally shiny. I started with mothers buffing compound, didn't do a damn thing. Then I tried mothers metal polish, works decent but way too expensive for how much I need. Then my brother gave me a liter bottle of Wicked Metal polish, apparently they use it for semi truck chrome and fuel tanks, this stuff works great even when polishing by hand. A few hours later and I rubbed off the majority of the aluminum oxide. I just got an electric polisher to finish off the rest of the job.
Before,
After a few hours.
Its not perfect but I think after a few passes it'll look better than ever.