All the planes I flew, in fact as it turns out, almost every brand of jet has installed in the cockpit a windshield spray called Rainboe.  I guess this was supposed to be just like RainX for cars.  But as I recall, very few pilots ever used it on aircraft windows since if you inadvertently sprayed in on a dry or not wet enough windshield it would make a mess you could not see through and you would not be able to get rid of the sprayed-on mess until you landed and had to listen to the poor mechanic pregnant dog at you for making the mess which was hell to remove.

Just when you thought it was safe to spray RainBoe on aircraft windows, there is this: https://archive.seattletimes.com/archive/?date=19901216&slug=1109705