1) Start the car and get it warming up,
2) Turn on the defroster,
3) Carefully remove snow and ice adjacent to the wiper blades,
4) Spray "Windshield & Window De-icer" on the wiper blades,
5) Give it a few minutes to melt the ice. Clearing the other car windows while you're waiting will keep you busy so you don't get PO'd, jerk the wiper blades loose and damage them.
We bought a bottle about five years ago and keep it in the trunk. There's still lots left.
http://tinyurl.com/24ukcwf