Naptha + Diff Dunker =
a diff dunker is a little metal strainer type cup thingy... Look it up on Amain, or google "tea infuser"...
Put all the little parts in the diff dunker, and stick them, and the diff cup, in the naptha. let them soak for about 15-30 minutes, swishing occasionally. Blow dry the little parts in the diff dunker while the cup is still soaking. Then, blow dry the cup. Should be good.
Don't stick the o rings or gasket in the naptha and use Mobil 1 on the outdrive and back sides of the moon gears when reassembling the diffs.
Makes a messy job easy!