[my427cobra]

This probably brings up a much discussed subject from past threads , but , I need some advice .
I blew the rear end axle seal on my Ford 9" in my replica and my rear wheel , PS Engineering halibrand look-a-likes , got liberally coated with that smelly black stuff .
Well I've tried a number of degreasers - brake cleaner , 409 , orange stuff , and I had no problem cleaning the machined surfaces , but the "natural cast" surfaces have absorbed the black stuff .
Any suggestions for cleaning that won't discolor my polished surfaces yet bring the cast surface back to its original finish ????
Greg