Paste Wax…wax is not designed to remove or cover up swirls. The only way to remove them is to polish by machine. As for your black car, they can get dusty 10 minutes after fully detailing them. Especially on your NPB paint, I don’t recommend trying to wipe it down with a quick detailer to remove the dust. Just wait until the next wash cycle if you want to prevent adding swirls. If you use a paste wax every 4-6 weeks, you should be good.