I have had good success with Lacquer Thinner in a spray bottle, spray it on the effected area until you have a strong drip and run off going. Let it drip dry and repeat several more times until the thinner is running out is clear. Most of the cases I have encountered have just been the head of the stock being saturated with oil, so I have not had a need to soak the whole stock. Not to say these sort of cases don't exist, just that I have not had the opportunity to work with one. As several others have mentioned, do wait for the thinner to fully evaporate before attempting finishing. I usually wait at least 8 hours, probably overkill but I prefer to play it safe. Just my two cents...
