Does anyone use a vacuum/blower combination to dry their car? If so, do you use it for the entire car.. or just the door jams, under the hood, crevices etc. And are there any negative aspects to blow drying your car like water spots or anything else...

And I feel stupid for asking this, but if you vacuum your car with a vacuum/blower combo and you then go to dry it with the blower.. wouldn't you theoretically just blow-out everything you sucked in (like in a shop-vac)? Essentially sand blasting your car? Or is there a seperate air bag for the blower?

What about this item..

http://autogeek.net/vacuumblowers.html