Dan, many of us have been there. This has been a regular topic on RCU. There have been many post about not using stock tanks that come with ARF's. I had the same thing happen when I first started flying though I had to have it happen twice before I realized there must be an issue here with stock tanks. I now use Dubro, Hayes or Sullivan and have never had a problem since. I honestly like the stopper set-up on the Sullivan tanks the best. IMHO.

Use KR-2 spot lifter to get the fuel reside out of the wood. It's a messy job, but this is about the best thing you can use after a spill. Let the KR-2 dry and then brush and vacuum out. Check your electronics closely to make sure no fuel got into the Rx. If it did you should send it back to the mfg. to have them check it out.

Once you have the fuel cleaned up and the airplane dried out check your glue joints to make sure the fuel didn't weaken. Add some epoxy where you have concerns. Just in case you are wondering, it will happen again if you use stock tanks.