Go to hardware store get 'Orderless Mineral Sprits' , 'Plastic Wallpaper tray', '0000 fine steel wool', 'acid brushes', 'old toothbrush', 'optional tung oil for wood
Diassemble SKS
Use Heat gun if needed to 'strech' tray long enough, if a Yugo.
put all steel parts in tray
cover steel parts with OMS
let it soak 1 hour or more...the longer you soak the easier to remove....I soak overnight
use brush to clean
THE MOST IMPORTANT THING; best to take apart firing pin assembly, but if you can't or don't, make sure you can hear the pin rattle freely inside the housing. This will prevent slam fire incidents. Old cosmo will dry and cause the firing pin to stick!!!!!!
use 0000 fine steel wool to 'lightly' clean any surface rust off, DO NOT srub!
use 1/2 OMS and 1/2 Tung oil to treat the wood. the OMS removes the Cosmo, but the tung oil treats it. After wood is clean let it dry.
Use 400 grit to remove humidty swelling from the grain of the wood and any defect. Also any 'crush spots can be 'steamed out' with your clothing iron. just use on high heat with lots of steam to force steam to "re-swell" the crushed wood.
After sanding to whatever finsh level you want use tung oil to protect and finish.
Make sure you treat the steel inside and out.
Enjoy the complements and the fun of blasting away with a heck of a weapon.