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heat melts the cosmo and makes it easier to deal with. I saw a post somewhere where the guy used one of those hand held steam cleaners and it melted/sprayed the cosmo out pretty easily. I am going to give it a try next time i need to clean one out. other then that varsol and elbow grease
Just came back from my sons garage. I stripped my SKS and used his parts washer filled with varsol. The thing came out great. Pulled the firing pin out and it had some comoline in it also . I cleaned that with some Q- tips. Wiping off the stock now with Dawn liq soap and water. All thats"s left now is to wait for the case of ammo I ordered.
People may think I'm crazy, but I use mechanic hand cleaner and a tooth brush to get cosmoline off. After scrubbing all the metal parts with the hand cleaner I Just rise everything off with hot water, let dry, oil, then I'm done. It smells nice and it's not toxic like other methods. The stuff works great plain and simple.
I have seen good results with cleaners such as "goo-gone" and "goof-off", I would imagine a lacquer solvent containing toluene would work well; never used it on cosmo but it seems to be the strongest solvent for anything oily, greasy or tarry.
I used a blow dryer, paper towel and Q-tips on all my Sks's. Spray brake cleaner on the firing pin. Make sure the firing pin rattles freely and it is good to go.
In the army manual they say to just wipe off the excess cosmoline and use kerosine for hard to reach places. But I used brake cleaner for metal parts and hair dryer with paper towels for stock. Worked fine for me.
I saw a great video on youtube where a guy uses a piece of 3" PVC pipe with an end cap on it to soak his Nagant and SKS barrels in, I tired it and it worked great. Soaked them for 20 minutes in kerosene, pulled them out and took the air sprayer from my compressor to them to blow off any residue. Super easy and gave me time to clean the stock up while the parts were soaking.