We just came back from a ski-trip in the X6 and I can say that snow, dirt, etc. were never a problem on the rear window. Our X5 needs a wiper back there, and it gets used frequently anytime the roads are wet, snowy, or dusty. The airflow over the X6 must be enough to keep all of that mess off of the glass asI didn't even consider cleaning it when I stopped to fill the tank. The tailights- they do get filthy!
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