Turpentine for a decent cleaning (wood stock). For a great stock cleaning check out the formula at www.thegunstockdoctor.com
. Depending on how much cleaning you need to do, either the turp or that formula should work.
Brake cleaner works well on the metal parts.
Once you have the stock cleaned, apply any stain you might want to use (not required - just depends on how light/dark you want it vs what you have). Then apply the 1/3 wax mix from the site above. It comes out GREAT!
Check out www.sksboards.net
for a walkthrough on disassembling everything.
No input on the folding stock, but I will say this. Since it is a C&R firearm, be sure any mods you do are 922r compliant or you could wind up having issues down the road.
Here's my SKS after applying the Tom's mix.