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Has anyone had a problem with dirty door sills after driving on wet roads?

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no it just warrants that the designers of the car hit the books and fix some obvious but easy to fix design flaws.
Almost All cars get dirt outside the door seals. Only vehicle I’ve ever owned that dosn’t get dirty door sills from the rain is my LX570. It has double sealed doors. Inner seal and outer seal outside the sills. That said it’s door sills are still dirty all the time, come to think of it I don’t think I’ve washed it in at least 3 months.
 
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I think the more aero a vehicle, the more likely you are to get a dirty butt, because a greater percentage of the air, water and fine dirt are sent back along the boundary layer of the car, and then the low pressure vacuum behind the car, sucks it back to the butt. A less aero vehicle, would just send most of it out to the sides, leaving less to stick to the butt.
 
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