Has anyone noticed when it rains, the water washes all the crap to the back and and it collects on the lower window? From the driver seat, most of the view (area wise) is provided by the lower window. Ironically, the upper window is the one with the wiper and washer, where I do not notice crap collecting...
The bottom window always attracts dirt & crud--doesn't matter if it rains. I've heard it is due to the aerodynamics. Grumpy Cabbie started the "Dirty Backside" thread about this.
Yea the rest of the back is dirty too, the area around the license plate and the bumper. But the things the bother me the most are the lower window and the backup camera lens.