I have noticed the suction cup marks on mine too - they seem to be on the inside. I need to clean the inside of the windows yet! I washed the outside twice so far - once by hand, and once at an automatic car wash.

I got nervous in the car wash at one point, since the drivers side mirror seemed like it took a good bump from one of the spinning cloth things (one that spins them from back-to-front). It is fine, but I do wish this car had folding side mirrors for these situations!