So it worked great. Car was covered in about 2-3 inches of snow with ice below it. Started the car and let her run for about 5-6 minutes. The front and rear defrosters took take of the ice and made the clean up a lot easier. I used a brush I use to clear the snow and it took me about 4 minutes total to clean my car. Was great.
Cleaning off my wife's minivan on the other hand is still a pain.