Dawn Dish Soap...
The Magic Way to Clean Your Windows - Best way EVER to clean windows. No drying needed, and you have no spots or streaks on your window! in case my link doesn't work - the recipe is 1/2 gallon water, 1 tbsp. Jet Dry, and 2-3 tbsp. liquid dishwashing soap. rinse windows with hose, apply soap mixture with sponge or other cleaning tool, rinse windows. No drying or squeegeeing needed!