One other possibility. We cannot get K2R here, so when I had a fuel line spring a leak and soak the wood with fuel, I asked one of the veterans in the club. He told me to get naptha from the local building supply place and make a thin paste by adding corn starch to it. Brush it on the wood and allow an hour or two for the naptha to dry. Then brush away the corn starch. I was amazed at how well it works.

As with all such solvents, make sure you have plenty of ventilation and/or a charcol cannister mask.