I am not an auto guru so take my comments with a grain of salt.
Normal window washer fluid has a small amount of alcohol in it that should mix with the antifreeze w/o a problem and since you got most of it out the chances that you substantially impacted the 50/50 mix is negligible. At most you added a cup in a system that holds 1/2 gallon or so.
If the cleaner was a rain-ex type, well those have unknown chemicals in them but I still think it is a non-issue. If you are concerned then you can drain (and flush) and refill the system for about $10.
I once added power steering fluid to my brakes. THAT caused a big problem! (This was a while ago when they were in the same type containers).
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Friday, February 19th, 2010 AT 8:18 AM