I think you are into paint correction with this (buffer).
Check out a auto detail forum such as Autogeek to get ideas on fixing it yourself. Or you could take it to a reputable detailer.
I hate these. Splatted insects can do the same thing if left on too long.
I think BMW clearcoat is considered "soft" as for why it is more vunerable than some other brands. But basically this could happen with any car given the right circumstances.
Good luck.
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