I suggest using K2R spot remover or talcum powder. With either, apply it (spray or sprinkle the talc), let dry (usually over night) and brush off. It is going to take a several applications to get the majority of the fuel out.

Once the fuel is out of the wood (or as much as you can get out), apply a coat of Sig Stix-It or BalsaRite and let dry 24 hours, then sand with 220 to remove any lumps/bumps. The Six-It or BalsaRite will give the new covering something to adhere to.

Considering it is just an aileron, have you considered cutting the old one out and replacing it ? You would need to relocate the hinges (no biggy) and inlet the aileron for the torque rod. The bottom line is that you would know the aileron AND the hinges are OK. The amount of work involved either way is going to be about the same.