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I put pee in mine. I've found that the high nitrogen content in my urine allows for faster evaporation which cools the intercooler much faster than coolant or any other liquid I've used.
its too early to laugh, thats what mitsu told me goes in it, unless the little button with a picture of the I/C and spray is for something else, its by the cup holder, says auto/manual.
wiper fluid would work, I don't have any data here at work on the heat of evaporation of washer fluid, but contains alcohol that will aid in evaporation over striaght water.