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ETA: If your doors are filthy, how do you imagine your lights magically stay clean?
I honestly have no idea, but they are. In all honesty I don't really have any visible dirt above the kind of mid way door line. It must be something about the shape of my car.
I certainly agree with others and have had the backs of hatchbacks I've had muck up relatively quickly, just never come across it to this extent on lights / mirrors.