To try out this 2 Ingredient Homemade Windshield De Icer, all you need is a clean, empty spray bottle, water, and rubbing alcohol.
Fill the bottle with 2 parts rubbing alcohol, and 1 part water, so if you use 2 cups rubbing alcohol put in 1 cup water.
Just spray the rubbing alcohol solution on the ice and it will melt instantly. When I sprayed it on my windshield the ice just disappeared.
You can also use this solution for thawing frozen locks on your car.