On metal parts, I've had great results easily removing heavy cosmoline using just plain boiling water poured over the parts and through the bore. If I want to soak parts, I'll add some Simple Green to the boiling water bath. Works like a charm, then just dry them thoroughly and finish with some gun oil or CLP. As for the wood, I've used the method of wrapping the stock in paper towels, putting it in a black plastic trash bag and setting it in the hot sun. Every couple of hours, replace the paper towels and give it a good wipe down, then wrap and repeat until the heavy flow of cosmo is done. I've done several this way and I am pleased to report it works well.
I like the new stock. My SKS didn't come with a wood stock when I got it 20 years ago, so I eventually through on an ATI tactical folding stock. It's really nice to shoot. Looks similar to yours, but with a different butt stock.
