You might first use heat and whiting to see if you can draw the oil out. Wipe with acetone, let dry and repeat. This method is used by a pro stocker friend of mine, and it has worked wonders on some old brit guns. Of course, you will need to refinish when you are done, and may still have to do some bleaching or acid work.

C Man
Life is short
Quit your job.
Turn off the TV.
Go outside and play.