I was scoping out where the dragstrip is in my area. Found the road, or horse path, and proceeded to weave around the potholes full of muddy water. Couldn't miss them all so got plenty of mud splashed on the passenger side. When I went to clean off the mud after getting home there was mud in the most surprising places. It was between the two rubber strips on the door sill. This was on a sunny day with muddy water slashed up from potholes. (It rains 2 minutes here and then the sun comes out again) It's easy to see why rust starts under the weatherstrip because water gets trapped between the two and can't get out. I wish I had taken a picture. When it happens again, I will.

I found this thread before I purchased my car and I dry the underside of the doors carefully after getting the car wet. I think its a good idea for everyone.

Les