Pintrest. This website gives three great ideas to help de-ice windows, prevent ice build up and how to de-ice a frozen door lock. I used the idea for de-icing windows...2/3 cup white vinegar and 1/3 cup water (a little less concentrated as the instructions state) and sprayed the window and it worked wonders! I was able to remove the ice with minimal effort after squirting the solution on the window. It took less than three minutes to clear a solid sheet of ice from the window. I'm going to remember this for future reference. Try it! I'm sure you'll agree with me!
UPDATE: When I went out this morning 12/6/11 there was a thick sheet of ice (2 days worth) on the husband's truck windshield. I used the above ratio in a solution to try to clear off the window, but I found I needed a second treatment at a 3:1 ratio which did effectively clear the ice after application.