For disassembly instructions, including the bolt, look here:
http://www.surplusrifle.com/downloads.asp
Using the instructions, remove the barrel and action from the stock, and disassemble and clean it and the magazine assembly and the bolt.
To clean the metal, you can buy a gallon of cheap Walmart paint thinner and use solvent-proof toothbrushes and bottle brushes to remove the cosmoline.
Pour the thinner in a coffee Can and let parts soak then scrub and flush with clean thinner until all grease is gone and the parts are clean.
Blow dry, or allow to drain, then use a hair dryer to warm the parts up. DO NOT use a heat gun, it gets too hot.
Do all this OUTSIDE.
Apply a thin coat of a good rust preventing lube like CLP Breakfree to all parts to prevent rust.
I use a clean toothbrush to apply the lube and "scrub" to get it into all cracks and holes. Don't use too much, just enough to put a THIN coat on all metal.
Use thinner on rags to wipe the stock off, but don't over do it and remove the finish.
Use a good grease to lube the bolt, inside and out, and the inside of the receiver.
Apply a THIN coating. Make sure to apply a dab to the cocking piece where it contacts the cocking cam at the rear of the bolt.
Clean the bore with a flush of hot water to remove any salts left by corrosive ammo, then clean with a good copper solvent type bore solvent, brush and patches, as normal.
If the rifle is shooting too high at the range you want to shoot at (It probably will), you can buy a higher front sight you can file down to get on target.
Any Advice?