How to solve the problem: Mix vinegar with water (use a 3:1 ratio), and spray this solution onto icy windows to clear them.

How to prevent: If you find your car’s windows already frozen, there is one simple way to de-ice them quickly. In a spray bottle, mix the following ingredients: 20 fl oz of rubbing alcohol, 6.7 fl oz of water, and 1 drop of dish detergent. Spray the mixture onto icy windows, and the ice will melt away.