To my knowledge ERL does not say one way or the other regarding washer fluid. They don't say not to use it or to use it. That is what I mean by they don't recommend using it - if that makes sense.
Some have used it for long terms with no ill effects, others have experienced clogging at unusual frequencies. Personally I have used straight water and water/methanol mixes with no detergent with no ill effects. I not only realize but fully appreciate that straight water in a windshield resevior is useless for cleaning the windshield it just smears everything. I still cannot recommend wash fluid but if it is used I would recommend diluting it with distilled water and methanol. Just make sure you don't exceed 50% methanol.
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