Constant build-up of bonded contaminants at rear
For the second time in a year, my car has built up a layer of bonded contaminants on the rear bumper and trunk lid. They come off with clay, but aren't building up on the rest of the car. Also, this is where dust / dirt accumulate first after washing.
So...am wondering if there's some odd swirling / turbulence at the rear that causes this? Especially if the top is down (which it usually is)? Anyone else experiencing this, and/or has an idea on how to reduce it?
2009 E93 M3 - it's, um, pretty fun
Last edited by M3Now!; 10-16-2012 at 07:28 AM.
Reason: iPhone auto-correction correction...