ughhh
What's wrong with the methods that really work
mechanical clean with abrasive drums in a die grinder {and that is the time to ease or close the fits}
or some times a dunk in Hydrocloric acid to remove heavy rust
Tumblers and such like will not knock the "Skin" off very well and certainly smash off sharp corners of the lugs of part. One will not get a polish!
I am puzzled by the search for the missing path when methods that have worked for a hundred years are still the best and for good reason.