I went for a ride and came across a stretch of road under construction. No problem for the CRF250M, I blasted right through. Only later I realized that they had sprayed tar onto the surface! I washed the bike several times since then but the tar is still over the front and bottom of theengine, the frame where the bash plate is and some parts in the rear. I tried WD40 out of curiosity but it didn't work. Any advice on how to get that stuff off?