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