I love these California Car Dusters and have been using them for years on all of my cars. I have covered parking so these work well if your car is slightly dusty, I would not advise using one if your car is extremely dusty or if your car gets wet (like overnight) then has dried dust/dirt on it. I have actually used a leaf blower to blow my car first (when it's really dusty) then used the CCD as a finishing touch. Yes, it does leave parafin or oil swirls on the glass and sometimes on the painted surface, but then I wipe those away with a microfiber cloth and my car looks just washed. I've tried others that use static electricity, but they don't seem to work very well (for me). When they get a little too old to use on my cars (generally three years or more), I use them on my mailbox, gate motor cover, (some) outdoor statues and planters, outside lights, etc. Living in Southern California, we find many ways to conserve water.