I knew a guy who was so meticulous about his car that it never saw water. He would use a duster and quick detailer to wash the car. Of course his car probably saw water at port and during transport to the dealer.
That's a real good way to ruin the finish. The duster is very limited as to what it will remove and then spreading what's left over the finish with detailer is not the best idea. Besides, there are airborn contaminants that can stain the finish even if it's not coming down with rain