I have always had BSM/MGs.. Initially protection right after delivery is essential for black cars.
It has been raining every other week in Melbourne as well, One a week wash is always good to remove dust/fallout/sea salt etc..
I've been washing my car at least once a week.. i think your washing method is incorrect causing swirls.. There are many good detailing forums where you can pick up some good practices (autopia/meguiarsonline forums)
You can find a good detailer to solve your current issue but the problem will reoccur unless you find the root cause of it.
Hope this helps.
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