Something that i did notice is when you mix different brands of traction compound the track will get really really slick. The dirt had nothing to do with it..well at least at my track. As soon as we went to just one brand of traction compound it made a huge difference..really. We had guys using paragon, TQ orange, blue..and a few other brands. It would gum up on the tires sorta of looked like dirt but it wasn't.