Folks who live in a dry climate like CO or CA might be able to "dust off" their cars without problems. Here, it's so humid most of the year that whatever falls on your car sticks and becomes part of this gummy mess that quick detail spray just sort of moves around. I use the spray to clean off bird junk and the like, but I don't try to clean the entire surface of my car with it. A rinse and spray with the Wax-As-U-Dry stuff once a week gives my car some protection, and cleaning off splotches of bird junk as soon as I notice them takes care of the rest.