All in all it sounds like a degrease and boil might be worth trying, maybe also boiling in a logwood solution. I'm thinking initially of the $500-$700 class guns. Most of those are too silvered or too brown/pitted to respond to a treatment like this and need a full refinish. I do have a gun enroute that might be a good candidate. Meanwhile, I'm sure we'd all be interested if someone gives it a try and reports back. Logwood seems to be available, is this the stuff?
https://www.ebay.com/itm/1-Logwood-T...cAAOSwsB9V9Kc7