Iknow what you mean! It drives me crazy. I have the same issue. I have a 2010 PW 370z nismo. I could wash and wax it all day, drive it for 10 minutes and only my rear bumper gets dirty. I know its not the road debris because I have driven it on clean streets and its not dust. It looks to be black soot/carbon from the exhaust. At first I thought it was my rear tires wearing quickly (they are at the wear bar already) but I ruled out the tires. I don't think there is a fix for this so I guess I have to live with it. Just out of curiousity what shape are your rear tires in?
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