See how simple this solution is? All you need to do is combine:
1 part water
2 parts rubbing/isopropyl alochol
That’s it! Bring the two together, and you have instant, easy, DIY frost-fighting spray. When you need to defrost your windows, simply spray it on your iced-over and/or frosty windshield, and watch how much easier it becomes – in seconds! – to both see and to de-ice. That’s some wintertime magic, right there.
It works because of the incredibly low freezing point of isopropyl alcohol – about 128 degrees below water’s freezing point! – so you can even leave this magic spray in your car to have on hand for any unexpected frost.
As Ken reminds us in the video, NEVER pour hot water on a frozen or cold window. The glass WILL crack and will be a safety hazard. Cold water only!
From: http://tiphero.com/defrost-windshield-in-seconds-with-weathermans-solution/
