There's a blue version of Methanol, called Nile Blue, methanol.
Found this:
"You can make a relatively benign washer fluid yourself with one part alcohol (pure alcohol, not isopropyl) and ammonia mixture and two parts water."
here:
http://www.emagazine.com/march-april_1999/0399aske.html
(Not sure if it'd cool very well though)
Here's more info on the poison/treatment aspect:
http://hsc.virginia.edu/medicine/cli...s/toxicalc.htm
You'd believe that the blue color is COBALT (also toxic) if you read this:
http://seasilver.threadnet.com/Preventorium/toxic.htm
but I have not otherwise been able to find out why windshield wiper fluid is blue.
