As K2R is becomming harder and harder to find, here is an "old fashioned" method. Use corn starch. Liberally sprinkle on (in) the area(s) and rub it in if possible. Let it dry and brush/vaccuum out. This works almost as well as K2R, however several applications will be needed to get all the oil out of the wood.

FWIW - If I have a separate fuel tank compartment in the fuselage I brush on a THINNED coat of epoxy (I thin it about 10% by volume with acetone ). This will take a couple of days to dry, but it will be fuel proof. Another option is to coat the area with clear fuel proof dope. Obviously, this is done prior to any exposure to fuel.