TD will likely advice to use a clay bar and quick detailer to remove those nasty stains. If this doesn't work, it's highly likely that some more aggressive cleaning approach will be needed, perhaps something similar with removing stubborn water spots.
I have an issue with stubborn water spots on my ceramic coated M3 (done at TD as well). It's frustrating that the clay bar approach is not enough so I'm going to try out CarPro Spotless and hopefully this product will resolve the water spot issue.
https://youtu.be/Il018tlKX7g





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