Brake cleaner then car wash
I have a high-tech apparatus built for said project. It's a section of PVC (6" dia I think) with a cap glued on one end. Put the action in the tube (no pun intended) and fill it up with cheap mineral spirits. You can put a cap on the other end if you'd like and let it sit in there for a day or so. When it comes out it will be pretty much clean. You can reuse the mineral spirits for other cleaning tasks.
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