I spent weeks getting my paint perfect and after going through the process, I do everything possible to keep it perfect. First off, most of the swirls, damage, etc. happen during the washing process. Get the car wet, let it soak with soap if possible, let the soap loosen and lift the dirt and do the work for you. If you rub the dirt into the surface you will get swirls. A duster won't scratch the paint but moving the dust around with it can. I don't dry my car, I blot with my special waffle towels. Lots of products out there will do the job for you. Adam's, Meguiar's, etc. (the ones I've used) A black car is the most stunning color when perfect. Few can keep it that way. (former black car owner) I had good luck with the back and forth method on a car with no clear coat. The Crossfire clear is hard. Tough to scratch or get swirls. But if you manage to somehow introduce swirls in the clear it'll take lot's of hard work to get them out. Wash the car frequently and the love affair will last.

Les