Porsche paint tends to be on the softer side and with it being black try not to touch it, with anything!
...in all seriousness, use a master blaster or leaf blower to dry the car and then go back with a towel. I then use detail spray with a GWDT to finish up the drying. And try not to touch it with detail spray or any other chemicals in between washes. If it is dirty leave it be or go 2 bucket. My black Macan has a glass coating, and although it still looks so glossy, when the sun comes out the swirls become very noticeable and it is only about 1.5 years old. The car did get washed mid-winter at the dealership, which I'm sure added to the majority of the scratches there. Next time I do an after hours drop off, I'm leaving a note with my keys, "Do Not Wash, and Thank you!"