I was under my Ford pickup this weekend and noticed that there are some 45 degree braces basically below the doors. The braces are about 2.5" wide and have square holes in them. The way they are attached they basically form a shelf where dirt collects. I can poke my pinky through the hole and rub the dirt. There was a triangle of dirt about 1/2" high there. It will just stay there and not get washed away by a car wash with undercarriage spray or driving in the rain.
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