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I have an older hatchback with a rear wiper, and I definitely _don't_ need it when the car is moving, especially on the highway: through some drafting effect, rain rarely falls on the rear hatch window. Only in an out-and-out deluge is the rear wiper needed.
In stop-and-go traffic, however, I use the rear wiper constantly on rainy days; because every time I stop, the rain gathers on the rear hatch window.
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