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I doubt it seeing as the dirt comes up from the road not down from the sky /ubbthreads/images/graemlins/laugh.gif
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Now, now!
The dirt is effectively sucked onto the back window by the air rushing back to fill the hole that the car makes as it moves forward.
The effect of a spoiler can (if designed to do so) be to force the suction point further back from the rear of the car - so that the window stays relatively clean.
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