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Was it like that when you acquired the car? If so, it might be the result of oil or brake fluid dripping on the roof while it was sitting under another car (rack or transporter). Try removing all the wax and clean it with a prep fluid or alcohol. It looks like it might have been on the sunroof glass and blown back off there.
Good luck
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F06 M6 Grand Coupe CP
Sapphire Black Metallic
The drive is the destination
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