removing Cosmoline from new rifle metal?

I bought an 03 Springfield once that looked like someone took a grease gun and filled the bore from one end to the other…… took forever…. Lots of patches and solvent… my guess is the rifle was never shot once it was rebarreled. Bore looked brand new.
 
I used to stick garand stocks in the back of my car at work and let the warm up on a hot day. Metal took a good scrubbing with hoppes and a paper towel… Or soak the metal parts in a large tub with diesel fuel. Worked well
 
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Any suggestions on how to remove the brown preservative from my new Savage 110 tactical rifle? Thanks! :)
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