Gas will work but it is very dangerous to use due to the chance og ignition from static electricity. This is especially true for plastic film coatings and conditions of low humidity. If you have ever zapped yourself getting out of your car or walking across carpet in your house you know what type of spark can be generated by sliding or rubbing a surface.
A bit of Oil, WD-40, Automotive paste wax, or like petroleum based product on a paper towel or rag will take off the black spots without the fire risk.
ORIGINAL: drksky1056
I've got a new Brillelli 40 (barely 1 gallon through it) on my Giant Sportster that is still spitting black crap all over the nice, shiny white monocote. Man, that stuff doesn't like to come off. Any suggestions? I've been using regular windex which does a very poor job. I did notice that if I drip some gas on the wing when fueling that the crap comes up really easy, but I don't want to take to cleaning the plane with gas. I was thinking about trying denatured alcohol, straight or dilluted, but thought I'd ask and see if anyone had ideas.
Thanks