Pretty car.
I'd avoid machine washes and maybe try to find a garage to store your car, at least an off-street lot. Get some 5 gal buckets and wash it yourself.
Streaking might have to do with air pollution or maybe soapy car cooking in hot sun? Try 'claying' these problem areas and see if that helps.
Tons of car detailing youtube vids and forums out there. I think MB was still using single-stage paint on these but am not 100%.
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