I finally got a chance to work on these again today, I bought a pad at the $ store that looks a lot like a chunk of pumice with a sponge attached to one side. I pulled out my trusty pocket knife and cut off a smaller piece, dipped it in hot water and scrubbed like hell on the rim.
Works like a charm! Black crud came right off, not too much effort, either. I discovered that after scrubbing for a while, it forms a paste and that really does it. Used a damp rag with the paste and these rims are clean!
Tires are showing up tomorrow, lug nuts are here already, about to get this party started....
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