Started cleaning mine around 9 am one day. I took it to the range about 4pm. Soaked everything in mineral spirits and used a hair dryer, and the sun, to heat the stock up to get all the cosmoline out. Good thing about it, is you learn the gun pretty quick having to literally disassemble every single part. I remember I was in the garage, and I put the bolt in a vice to take it apart, and knocking that square pin out, and it skipped across the floor. Thought it was gone for sure!
Fwiw, I once bought a dozen SKS (Chinese) at a SC gun-show LATE on Sunday PM for 45.oo each.
I think that that was the most difficult preservative that I've ever had to remove from any firearm.
(It was a greenish/waxy coating that only strong detergent, degreaser & lots of boiling water would touch.)
Took me over two hours each, over 2 weeks in the evenings..
I wondered thereafter IF the reason for the "cut price" was that the vendor didn't want to expend the time/elbow grease to clean them up for sale.
Nonetheless, I did make a nice profit on the sales, presuming that I counted my labor as of no value.