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Something I have used with sucess, soak your steel wool with "Simple Green" and rinse under hot water. If you are going to do any amount of carding and have time, get a 4 row brushing wheel from Brownells. Good luck
I don't bother and so far have not had a problem with oil in the wool. I degrease the barrel(s) by a wipe down with acetone followed by washing with lye to saponify any remaining oil.
If you are "carding" the metal when either bluing or browning, you have to remove the oil in the steel wool prior to using it, otherwise it will streak the chemical on the metal, potentially ruining the finish.