I use an air compresser, works great. Here's another tip for the side-view mirrors. You guys know how annoying it is after you washed your car then take it for a spin and you see nice streaks of diry water originating from the mirrors. Well to remedy this situation, fold your side-mirrors in. Ya' know, how the mirrors can be folded inwards for tight parking spaces, well there is a 2-3 mm gap there and that is where most of the water dwells. Fold the mirror in and blow away. There's actually more water in there than behind the mirror inside the compartment. I also tilt the mirror so I can easily blow the water out of compartment too.
-crontab -l
-crontab -l