Inner liner under door panels?

Don't leave these out if the car is ever out in the weather. As noted before they keep water that dribbles down the window through the window seal off the back of the inner door panel. Don't miss sticking the bottom of the plastic sheet into the slot at the bottom of the door to send the water into the door and out the lower vent holes (behind the black tape in the excellent photos above). Lots of our cars have ruined door panels because someone fixed something in the door and just threw the plastic sheet in the trash.