I believe a worn seal is why I have water int he Audi - 95 A6 base. The car is usually parked facing up on an incline. I have made sure many times that all the drains are clear, and they are.
The back seat is soaked, Ive shop-vaced several gallons of water a few times.
Today it is dry so I could get the car wet...
I added a couple drain holes under the rear carpet, - to be plugged when I have the intrusion stopped.
Dribbling a garden hose over the doors and the rain gutter, no water inside.
Rubning water over the sunroof, I noticed that the left rear corner was not pooling water like the rest of the seal.
Now I am searching for a new seal - looks easy to install, but in the meantime, I am contemplating a car wax paste to fill the gap, otherwise I could go with packing or duct tape.
I'd rather avoid the tape bit cause its a pain to clean up later.

If anyone has a hit on reconditioning the seal and/or a fine source for said seal, I am in the market!

PS: I still haven't sorted out my dead power seat. (possibly killed by the water, but the module shows no signs of water.