For what its worth, back in my rallycross days we just used to kitchen towel all the oil out. Any that remains after a good attacking with the 'Bounty' isnt going to effect the diff once you put new oil in, and brake cleaner will adversely affect the o-rings inside the diff anyways.
Just out of interest, is there any form of gasket/big o-ring sealing the diff gears to the diff?
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