Some domestic glass cleaners have ascetic acid (vinegar - an old wives trick for cleaning windows and leaving them smear free) in them. The pattern of corrosion on your mesh looks like could have come from spray??
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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