If your vehicle is newer you may encounter a fitted vapor barrier inside the door panel that will have to be removed first in order to clean window tracks.
Car door panel vapor barrier.
You are correct art1966.
This is a universal fit paper shield with a black plasticized film on one side.
It is installed between the door panel and the door.
Provides water vapor protection.
Whether the barrier piece is styrofoam based or a plastic sheet it will typically be glued on with a rubbery sealant.
Slight amounts of moisture will inevitably seep in around your door and window seals.
Just behind the door panels are sheets of plastic to keep moister from creeping into your vw.
It comes in a 12 feet roll and is shipped in a 3 inch tube for protection.
It is installed between the door panel and the door.
It provides a degree of water protection to your inner door and is designed as a vapor barrier.
One example of a coverlay oem style inner door panel.
It provides a degree of water protection to your inner door and is designed as a vapor barrier.
645 470 door panel moisture barrier protect your interior door panels with our precut easily installed moisture barriers.
12 foot roll universal fit provides water vapor protection this is a universal fit paper shield with a black plasticized film on one side.
The vapor barrier keeps the odd drip from the window from splashing on the window mechanism and wetting the speakers and other electronics in the door panel but if you are getting enough water to wet the carpet there must be a blocked drain hole.
When this happens you might find water puddles in the car have a constant damp smell find water stains on the lower edges of your door.