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Strange that it is there, but looks like the surface has had some contaminated water or liquid on it, appears to have puddled and stained as it dried. It doesn't look like rust from under the surface, it will wipe off if I'm seeing it right.
How it got there would be more a concern to me, but it should just wipe or polish away. If it was my car that's what I'd do as a matter of course.
HighlandPete
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