Dip chrome and steel parts in Oxalyic and any parts you can't dip use Barkeeper's Friend on with a scrubbie pad. Rinse well and then use chrome polish with wax to protect from further pitting.

To clean hubs inboard of the flanges while still spoked a slightly-wetted toothbrush can be loaded-up with Barkeeper's Friend and that will do a great job on grease and light rust. Really bad rust scabs can be carefully pulled off with a dental pick. Dunking is OA is better but on hubs this means you need to strip them first of spokes and the guts. Toothbrush and OA, with a dental pick for bad scabs does OK, you might pull a tiny bit of chrome off too, but usually a scab will just pop off it isn't too bad.

Barkeeper's friend works well on alloy parts too. Be aware that once you dig through any protective finish on alloy parts it'll need to be protected again from oxidation and nothing protects like the original coatings.