Look at fuel filler caps on D2s - the paint wears through on the lower left corner and then they just rot away. The cap may be a different alloy to the rest of the body since it corrodes uncharacteristically quickly.
The rest of the panels are not immune either though - again, where the paint wears through on corners, oxide creeps under the paint like plant roots. I have this on the sunroof and one door of my S8. Its quite common at the top leading corners of the rear doors too.
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