This Audi had an unusual water leak caused by a hole in the door rubber. As far as we know, this isn't a typical problem on the A4.
You might possibly be able to patch this hole with some sealant, but this might cause further leaks by not allowing the rubbers to seal together properly. It is always important that your rubbers make a good seal, so you must keep them clean and supple, and rubber reviver can work if they are dried out and cracked.
In this case, the solution is to replace the rubber with a new one that doesn't have any holes! We will then of course dry the car as the carpet in the passenger side footwell is wet and the carpet soggy.
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