Cleaning you plane is a complex process. As Chris said, you need to burn it off with a torch. But first, it is best to disassemble your plane and soak every part (including electronics) in mayonnaise. Then, once the mayo has been left on for 24 hours, quickly wipe it off, put it back together, and stick the whole plane in the tube. I forgot to mention that to clean the engine you take the glow plug off and put mayo in that too. Anyway, you put it underwater, and once it is thoroughly drenched, take it out and use the propane torch. Nitro works well too. You plane will then be fuel resistant and clean forever.