That is a familiar sight. It can take a lot of time and effort to get it out. Just keeps coming to the surface. Patience and keep repeating the cycles.
I had one that after weeks of heat and multi-day acetone bath cycles, the oil was still coming to the surface. I then got impatient and boiled it in a water/TSP solution followed by a clean water boil to rinse. A ton more came out that way and after a lengthy (weeks at room temp) natural dry heating brought up no more. Probably not a recommended method since it might crack or split the wood in the boil or dry stages. I was lucky and it turned out great.
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