for the best look, remove parts and use a bench buffer and rouge.
for an ok finish without removing the parts, very carefully spray airplane paint striper on the covers without overspraying onto painted items like the frame. maybe i should say, mask off areas with paint that don't wish the stripper to ruin. all the aluminum has a clear coat or something sprayed on them at the factory. it turns gross and yellowish. this paint stripper will remove it.
next, get some running compound and applicator pads and cloth towels to buff the compound off with. the powerball does work well, but its pricey and can't get all the tight spots.