i googled windshields in winter conditions & saw this
Washer Fluid Spray Bottle for Ice Free Windows
Date: 02/18/2010 Topic: Cars > Winter Driving
Living in a very cold climate I found this to be a very useful tool for winter days. Purchase a gallon jug of the re-fill windshield washer fluid and fill a small spray bottle with the liquid. When your windshield is iced over spray beginning at the top of the windshield and work down towards the midway point.
As I recall the jug directions say that this can be harmful to paint finishes, so be careful and use sparingly. This starts a melting process and the top area will loosen up by time you get to the other side of your car.
One year I gave little bottles of it to my staff and they were rather doubtful. When the staff actually used it, they reported back that it truly works a miracle!
Homemade Windshield Washer Fluid
Tip: Washer Fluid Spray Bottle for Ice Free Windows
Archived on 02/18/2010
When filling my windshield washer fluid for winter, I save some of the solvent and put it in an old squirt bottle. In the evening I spray my windows and mirrors, and in the morning the ice has never built up.
When warming your car up, it is great to have sprayed the outside of the windows first. It really helps the defroster clear the windows much quicker.
Vinegar will help keep windshields ice and frost free. When a car has to be left outside overnight in the winter, coat the windshields with a solution of 3 parts White Distilled Vinegar to 1 part water.A good tip for frost free windshields is believe it or not shaving cream.rub it in good and wipe off when starts to fog up reapply.
You can also use the above tip with alcohol instead of vinegar I like the green kind best.
try shaving foam on your bathroom mirror to stop it from fogging up, works great!!
Lift the Ice off the Window with this Homemade Deicer
You can use a household spray bottle for this. Mix a bottle of isopropyl alcohol (70% is best but 50% also works) and a few drops of dish liquid. Spray the windshield liberally, and in a few minutes, the ice lifts off the window. Also, try putting isopropyl alcohol in the washer fluid container (half fluid and half alcohol) to keep your wiper lines from freezing up in the winter.
when you pick up the winter windshield wipers, don't forget the
Rain X/Winter De-Icer windshield washer fluid
good thing winter does not last all year long