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For fuel soaked fusalages, try mixing baking powder and rubbing alcohol in to a paste.  Apply a    generous coating of the paste to the fuel soaked area and allow to dry for a couple of days.  As the     mixture dries, it will absorb much of the fuel out of the wood.  Clean off the area with a stiff brush
and fuel proof using your favorite method.  For wood that has started to deteriate, the best repair is still replacement.