Heat and time is what it will take to remove cosmoline and oils from a wood stock. It takes years for that stuff to soak in. Many people suggest to leave the stripped stock in a black garbage bag out in the sun (on your porch/deck, car dash, etc). Wipe it off and repeat the process with a new bag. Obviously that is something you can only really do in the summer time unfortunately. After that wipe it down with mineral spirits. That will help mop up remaining surface grease/oil and absorb into the stock to keep it from drying out while also not affecting color. Then apply linseed oil. That will also take time. Light coats by hand with several days curing time.
Heat and time are your friends with restoring old stocks.
"Give me Liberty, or give me Death!" - Patrick Henry
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