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A little sports sedan (a Mitsubishi I think) has vertical fins on the trailing edge of the roof to create tubulence or break the suction on the back. I wonder if something like that would help keep rear hatches clean in wagons and SUVs? I read somewhere that the X-Trail collects more than its share of dirt because it's relatively streamlined. The coefficient of drag is comparable to a lot of cars, so there's a smooth stream of air running over the body and right to the tailgate. I guess that makes some sense. :rolleyes:
 

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Howdy 1.6 pete,

I use some spray stuff in a purple bottle (Prestone, maybe) that works better than Rain-X and is much easier to apply. It works so well on the windshield that you often don't even need wipers at highway speed. On the rear window, the dust does tend to just fall off or wash off in the rain.
 
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