I've used it on my cars for about 10 years now. You can still get water spots as Mike said. I always leave a little water on the car in a shaded spot, enough to dampen the towel, so I finish drying with a damp towel then I use my detail spray, that gets most of any spots left on the car. Its best to wash a dark car out of direct sunlight, in a shady spot or at dusk. The blower gets the water out of all the nooks and cranny's you otherwise wouldn't get with a towel. Just be very careful around your car with the blower, it can do lots of damage if you drop it.