i used to have the same problem when i was driving truck, the heavy duty metal wipers iced up alot easier.
i have found that most blue washer fluid doesnt really do anything to halt the formation of ice, in fact here in west virginia there have been a few mornings where my windshield was iced over, and my defroster was almost done and in a moment of what i thought was brilliance i hit the washer button only to have it turn to slush and freeze on my windshield.
-20f my rear lol, it was like 18*f outside at the time.
i know that the peach rain-x will actually melt the ice.
i used some purple of the auto parts store once that did the same, i cannot remember the brand name, nor the temperature rating.
funny thing, im a washer fluid nerd, much like alot here are oil nerds lol.
heres a thing i used to do when i knew i would use my washer alot in extreme cold.
i used to dump a bottle of iso heet into the washer tank.
as a truck driver, i might be in the southwest for a week or two, where blue fluid is perfect, only to get a load going up north where it would freeze.
i would use it normally until it froze, then i would find a place to pull over and i would lift my bunk and dump the heet into the reservoir and it would save me alot of time that would be spent on the side of the road leaning out the cab and breaking ice off the wipers.
your mileage may very, and for all i know that info/advice could be bad for modern cars but it hasnt bothered my crown vic, or the montero i used to have.
