To polish, I'd start with a green scouring pad and go to town. Get all the debris, grime, etc off and clean with a wet rag. Then I'd start with a fine sandpaper like 320-360 and go over each wheel. Then step up to a finer grit like 400, repeat. Step up again to 600, repeat. Step up to 1000, repeat. Step up 1500, repeat. Step up 2000. I've never polished anything simply because of the time and effort. I'd expect 4-6 hours per wheel.
You think there are compounds I should use or do you wet sand at a certain point?
4-6 HOURS isn't gonna be worth it lol. Hopefully that's assuming by hand? Damn at that point I might check out harbor freight for a cheap polishing kit for my angle grinder or something lol. Then if I end up giving up I don't feel so bad