I've used K2R (dry cleaner for carpets - I get mine from Ace Hardware) for cleaning fuel soaked wood also - wood so soaked that is was black deep down into the grain to the point the black never came out of the wood. I sprayed the K2R on and let it sit 24 hours. I wiped off the white powder residue with a paper towel followed by a wipe with rubbing alcohol, then repeated a second time. Afterward I wiped the area down several times with rubbing alcohol, did a light sanding followed by a wipe down with a tack cloth and another quick wipe with rubbing alcohol, and then recovered. I found the covering (MonoKote) stuck with just hand heat, and after I used an iron on it I found it almost impossible to lift without destroying the MonoKote. Over 2 years later when I sold the plane the covering was still stuck and showed no signs of wrinkles while the rest of the plane was showing typical wrinkles from seasonal change.

Hogflyer