Maybe because the leaf blower is concentrated 70mph wind and it causes the dirt to stick to the surface of the vehicle. When you drive 70 mph, the air is not concentrated and the actual wind force is different across the surfaces of the vehicle, mostly cause the air is directed over the surface and all the drag/force is in front of the vehicle.
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Gardener w/leaf blower blows dirt on my car. Why doesn't driving 70mph blow it...
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