We have to dust off the seat before anyone can even get in the back seat. I have to wash off all the bottom trim or it gets dust/mud on all my pants.

I live on a gravel road and my Taurus SEL has black leather seating. The back doors started leaking dust immediately once I purchased the car. The dust comes in at the bottom of the door and then settles on the door jam and back seat, creating a nice gravel dust film. The film must be wiped off before anyone can sit in the back seat, and even then it leaves dust on peoples clothes! Super annoying!