.45&TKD is right. This is one of those subjects that has been debated a lot and results in a lot of different opinions.
One thing I havne't mentioned in my replies is whether or not I'd do the dishwasher method again.
I don't know yet. It worked and I'm happy with the results. It was quick, unmessy and simple. However, I used it on a generic, un-historically significant Yugo SKS stock. I don't think I did any harm to the stock with it's one time in the wash cycle. I would never even think about doing this on a rare/interesting/fragile/damaged stock.
But, I have one major issue with the dishwasher method that I haven't reconciled to my satisfaction. What happens with that cosmo cools in my pipes?
Now, since I've done this only once, I don't think my pipes are about to clog but I do wonder about my pipes and the down stream swerage systems.
So, what would I do next time? Heat is really what gets the cosmo to flow (melt) and get out of the wood. I plan to make an oven of sorts. I was thinking out of some black drainage pipe and let it stand in the sun. Or a lightbulb heated oven like this:
http://www.surplusrifle.com/shooting2006/lowheatmethod2/index.asp
I think this is a fantastic article. It's really well written and clearly illustrated with pictures and drawings. (As are most articles on that site. Great site.)
I want to try this if for no other reason than to compare it to the dishwasher method.
I also agree with .45&TKD that harsh chemical cleaners aren't necessary. Paint thinner disolves the cosmo just fine. I can't imagine the need for something like oven cleaner. Unless of course your stock is covered in baked on drippings from turkeys, roasts and pies.
Andy