I have owned a Mosin, Mauser, and SKS. All were caked with cosmoline. I tried it all. Spirits, brake cleaner, gun scrubber, rem oil, isopropyl, and various solvents. NOTHING has eaten the cosmo and melted it away better then CRC
"mass air flow sensor cleaner".
This:

They make other products, and nothing comes close without leaving residue.
Just thought I would share.
"mass air flow sensor cleaner".
This:

They make other products, and nothing comes close without leaving residue.
Just thought I would share.

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