I’ve found directions on how to make your own window washer fluid on a website called http://www.diynatural.com/
Yet another way to become cost effective at home, make your own window washer fluid for your vehicle!!! This is not like the commercial windshield washer that is poisonous because it is NOT made with methanol.
Non-toxic Windshield Wiper Fluid
1 empty (clean) gallon jug
8 oz rubbing alcohol
1 oz liquid castile soap
Pour the rubbing alcohol into the empty jug. Fill the jug with water, leaving room for the soap. Slowly add the soap to the jug. Cap the jug and gently tip upside down a few times to mix ingredients. Pour windshield wiper fluid into the windshield fluid compartment under the car hood.
*Picture from Flickr.com