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I was just thinking about a video on that water spots problem of yours... just need to find a car with such problem... how long have those water spots been on the 300's paint?

A week or so. Washing it helped, and it's becoming brittle and coming off by rubbing. The glass is harder on the side it got it the worst.

So it's new.... I guess it's not a single stage paint... it has a clear coat... you need to get a water spots remover, like Car Pro Spotless... just spray onto the paint (clearcoat), wait a bit and then wipe it off with a good microfiber towel... the same on the glass... no hard rubbing needed...