Years back I used carbon tech! Bad stuff dangerous and now banned. But it did the job well. I had a pan made to size with a tite fitting top. Poured in enough to cover the stock, put the lid on and let it sit overnight. Most of the time the stock was still there and the oil wasn't. Poured the carbon tech back in to the can through a doubled paint strainer with gauze padding. All of this outside with appropriate breathing protection. I am not sure I would do this today but it worked. It was shown to me by an older stock finisher that was not as careful as I was. But last word was he was still playing tennis in his 90's. In fact I just finished deoiling a stock with whiting mixed in acetone and heat and it worked well. Just took longer.
John Mc
