What's the best stuff to add to winter washer fluid to keep it from freezing and not damaging any internals? Vodka/Everclear? Isopropyl? Hoping to make sure what I add to the fluid doesn't mess up any plastics, rubber or body paint if it gets on stuff other than the windshield.
The winter stuff I got from Costco sucked. Like it has been freezing near immediately and clogging up my wipers like super chilled water. The stuff I bought didn't do that in previous years. Must be a bad batch. I got some reflex brand stuff rated to -49C in the meanwhile and it was exactly what I expected this morning when it cleared out the light frost and evaporated cleanly.
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