Tried something today. In past I have used mineral spirits, brake cleaner spray, heat, simple green, etc ad infintum.
Just picked up a Mauser 24/47 that had HEAVY cosmoline. I could have put a frickin' WICK in the thing, and used it for a candle. Too cold to go play outside with brake cleaner.
Handling rifle, got really dry cosmo on my hands. Did not want to wipe off, just sort of smear. Oh, yuck- where's the hand cleaner? Grabbed my tube of Goop (orange based) squirted a dab in hands, rubbed, cosmo gone. Hey- wait a minute!
Stripped action out of stock, broke it down, grabbed a chunk of Mauser, tube of Goop, and a nylon brush. Scrubbed for a few seconds, dunked under hot running water- and- well, I'll be danged- nice shiny Mauser. Even dunked bore brush in Goop, cleaned out the cosmo in the bore.
Took a dab of Goop, rubbed stock by hand, wiped down with paper towels. Rised all metal parts under hot water, dried (yard sale blow dyer on workbench comes in handy) Oiled parts, reassembled. Looks really good.
My tube of Goop was a buck from the dollar store. Figure I used about 7 cents worth. No gloves, no danger of setting self on fire, etc.