I agree djomlas !
I was just commenting the other day to a friend of mine on why when I wash and Zaino the Box and the Benz, after a couple of days of driving both the Boxster is all dusty and looks like crap, and the Benz still looks freshly washed ( both are black, and the Boxster sits in the garage while the Benz is outside ) ? This is taking the same route to work, and parking in the same underground parking space at work. I just don't get it
Nick