Thanks to everyone for the comments and the recomendations. The stopper was completely out of the tank so your theory on it popping out makes sense. I think I will try disassembling the cline and having a look. Although I really don't know what I'd be looking for to indicate weather it was bad or not. I will also probably try running the Saito 100 setup without a cline to see if it works OK. I originally got the cline when my engine was brand new and hardly broke in. I bought it in response to several posts early on in this thread telling about problems with the elevated gas tank. It can't hurt to try it.
I've never heard of K2R spot remover, but I'l look for it next time I'm at the store. I live in WV so I'm not sure weather it's illegal or not. If I can't find it I'll try the dry compund that shogun was talking about. I'm sure it's easy to find. I'm not really sure how much fuel is soaked in the wood. It doesn't look like much, but the foam I had the tank wrapped in was really wet. In fact it seemed like it was kind of absorbant in a way so maybe the foam soaked up a bunch of the fuel. I think ost of the fuel ended up on the outside of my plane. It was a mess
ORIGINAL: Shogun
Considering the pressure the Cline can put on a tank it's not surprising that you have as much of a mess as you describe. You said the stopper came out of the tank. Did the stopper come all of the way out of just loosen up in the neck? If the stopper came all the way out I would bet that the result would be very much like popping the top on a shook up, warm soda can. All the pressure in the tank attempting to escape all at once in an instant, carrying the fluid out with it, makes a pretty big mess when it happens. I would bet that a lot of that fuel escaped out of the tank neck hole in the firewall and made it to the exterior of the plane causing the mess you described.
I opted to use a Sullivan stopper on mine, the plastic disc's and sheet metal screw are far less likely to loosen up over time and with vibration. I also think that the rubber GP is using for the stoppers in their ARF tanks is prone to shrinkage with time, resulting in the leaks and other problems many of us have experienced.
I'm not sure about the spray your talking about but a trick I have used very successfully is simple floor dri compound, you know it as the stuff mechanics pour on the oily spot on the floor, it is NOT kitty litter BTW. Whenever I have a tank leak in the nose of a plane I just pull it out and fill the nose up with the floor dri and stand it in the corner for a couple of days. The compound is VERY adsorbent and will literally pull ALL but the minutest amount of oil out of the wood. The only drawback to using the stuff is that it takes time to do it's job so patience is a virtue when using this method. You can get the real stuff at most auto stores and it's usually pretty inexpensive.