So, I am detailing this client's pick-up, and there are little, 1/16th of an inch dashes all over the driver's side panels. It's definitely not tar, not bugs, not dirt. It is black in color. It's really annoying and it is killing the overall look of my polishing regiment. Before polishing, I tried a clay bar, car wash soap, tarminator, and zep citric degreaser. Then, I took a bug sponge and vigorously scrubbed a small area. The dashes started to come out but at the cost of heavy micromarring. Basically, I am NOT doing this over the area b/c it is not worth it to heavily scratch the area. It seems that the same matter was on the rubber trim and chrome side steps. On those surfaces, the matter easily came off with a clay bar and some degreaser. But a clay bar (and degreaser or any other liquid in my arsenol) on the paint will not remove this stuff. Here's the only thing that might help. The owner of the vehicle cuts grass for a living. Maybe it's some sort of material from being around that? Any suggestions? I don't think pics would help at all, but I'll try to take some tomorrow. Thanks