Another vote for the CA Duster. The auto parts houses have a version that works just as well. I follow dusting with a product like Meguiar’s spray Quick Detailer and damp micro-fiber towels to remove bugs etc. I follow this with the occasional premium carnauba paste wax. For my truck, washing with a hose and suds is an absolute last resort except for the tires and wheels.

http://i1291.photobucket.com/albums/b542/RdLessTaken/IMG_85261_zps90bf2b98.jpg