Can You Defrost Windscreen With Warm Water. Fill ⅓ of a spray bottle with drinking water and add an equal amount of rubbing alcohol to it. Does anyone else use warm water to defrost cars?
Another reusable option is a hot water bottle filled with boiling water, diluted with a little cold water. Rapid temperature changes in glass can cause it to crack, and automotive glass is no exception. That means that is it freezes overnight, the wiper blades will not have frozen to the glass half way across the screen.