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I've had frozen cars for a few years and haven't seen this.
If it's only down there on the bumper, it's almost as if the car went over some oil spotches. I would wash the bumper with matte-safe soap like Meguiar's Gold and see if the water beads evenly afterward.
If not, BMW does sell a chemical decontaminant for frozen paint (which I can't find anymore) that would probably be worth trying. It's good to have on hand because it's the only way to remove deposits; you can't use clay on frozen paint.
Charles
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2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue, 6MT
Past: 2021 Z4 M40i Frozen Grey II/Black Alcantara | 2017 F30 340i Mineral Gray/Coral Red, 6MT | 2011 E92 335i Le Mans Blue/Black, 6MT
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