Hi,
I've got a 69 reg A6 Avant Black Edition 1year old with 15k miles and have had the following issue develop.
The black trim that surrounds the windows has started to develop clear parts, most noticeable on the rear offside upright, but also on every corner and the folded leading edges. I've attached some photos to help show this. The front grill, exhausts trims, rear tailgate black strip or the plastic door pieces have not developed this issue.
It's the 3rd black edition I've owned, the other 2 being the A4 Avant and never seen this before. No change to cleaning products, equ