WD 40 gets abused all the time, but this is a great use for it. Put the bearings and cages in a baggy and spray in a bunch of it. Seal it up and let it sit for day, and it will have disolved all the filthy grease trapped in there.
jim
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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SB forever