Extreme green envy.
To clean the cosmoline off the metal any grease cutting solvent will work just fine, but remember to wipe the metal down with a lightly oiled rag after to protect from rust. The wood I wrap in paper towels and a black trash bag and sit out in the sun while cleaning the metal. Heat will push the grease and oil from the wood without disturbing the acceptance cartouches. Go slow and easy on the stock some turpentine to clean off the wood and let the sun do the work for you.
A Greek Rack Grade M1 I bought from the CMP way back when took me a couple of weeks to gently "degrease" the wood. Well worth the time invested.