I thought about dropping it all in some Valvoline Restore and Protect but don't have any. The shells are good for a few more bangs in the over/under he'd say.
I've used carb cleaner before with great results. Just keep the stuff away from the wood or any plastic parts. And make sure you oil quickly after, a fully stripped gun can rust quickly. Probably no plastic on that gun though!
Use electronic tuner cleaner instead of carb or brake cleaner. It cleans well and does not harm rubber, plastic or stock finish. Costs more but worry free.
The trigger group is easy to drop out here it is. Also the inside of the receiver.
WD-40 giveth, WD-40 taketh away. One good thing about WD-40 is it's a good gentle solvent. Sprayed everything with it and used a toothbrush, several rounds then some Gun Scrubber then lube. View attachment 310186 View attachment 310187 View attachment 310188
Also remember I had a box of the last shells he loaded a long time ago. Dad was frugal, he'd use a casing until the crimps tore. View attachment 310189