While I do not have to deal with snow, ice, salt or slush....My Alpine White X5 (which I love) is the HARDEST car & colour I have ever owned in terms of keeping clean.

I use a California Duster everyday, and with the flat (non-metallic) Alpine White, the dust (which looks black) just kinds of moves around, sticks and accumulates on edges and in crevices. With our 2 metallic cars, the dust just lifts off the paint immediately.

I do not understand how the Alpine White does not dust....and YES..the Rear of the car gets dirty even after a short drive. Driving the car in the rain (even light rain), the rear of the car looks like I went off roading. As blue dragon said, the rear has crazy low pressure and is very turbulent.

I LOVE the look of my Alpine White, it's my favourite colour on the E70...but if I get another X5 when the new model comes out....I think I will get Platinum Gray, Titanium Silver or I really hope Breakwater Blue Metallic is finally offered on the X5. Breakwater Blue is, IMO, THE BEST colour BMW has ever made!!