When you pick up your rifle you are going to need to get something to remove the cosmoline off with.
I got mine off a consignment rack with all the SWAG that comes with the cosmoline drenched guns..... but mine was aready cleaned..... $99.
My Yugo SKS took near $10 worth of mineral spirits and several days to clean the gunk off. It also needed a paperclip gas system fix and a Murray's firing pin to keep it from doubling..... it does not hit as hard, is less reliable, is almost as accurate, just as heavy, and cost more than twice as much as my Mosin. I wish I had bought another Mosin instead.