CarAndDriver

Fortunately I live where it rarely gets below 32F.

YT1300

Heated washer fluid is an interesting concept. Provided the stuff is warm when you start off, it will have some benefit in de-icing the most frosted/frozen over windshield on a cold morning. However, consider that you're not likely to be sitting still most of the time in the car when you use the washer fluid - you're probably going to be at speed, or at least moving around a bit. The fluid has to be relatively warm once it leaves the reservoir to traverse the tubing to get to the jets, and then, to the glass, before being 'warm' will make any difference to whether or not ice forms on the windshield.

Driving at, say, 140 kph in -20 C is tough on washer fluid - most regular stuff freezes up as soon as it sits on the glass for about ten seconds, and the tougher stuff takes a little longer. You still need some heat on the glass for this to not freeze.

CarAndDriver

For awhile some makers were touting heated windshields. Not sure where those went though.

YT1300

Heated windshields needed an element to run through them to make it work, I think, and they were let go because at least for automobiles, something about the design wasn't practical.

I think they have them on commercial aircraft, though I cannot confirm this. Any pilots out there?

DarkBrew

Chrysler included a heated windshield area down where the wipers park. While this may not seem all that useful I can tell you that driving in freezing rain will convince anyone that this has real value. It seems to make the wipers more effective in cold conditions.