If you click the photo it should open up huge for you. Please, please ignore the rampant meadow that is my lawn, it is now cut. I promise! At any rate, like many people with dogs, I have a constant streak of nose marks across my window at Beagle nose level. It is gross and cloudy and snotty and even has little run marks when they are particularly excited and fling snot. In other words, I have window challenges.
While there is some reflective cloudiness on the windows, it isn't them but my camera work and you can take it from me, there was not one jot of difference between the two windows. And while I did notice an immediate vinegar smell when I sprayed the windows, it was gone by the time I was done. I think it must evaporate quite quickly.
The recipe is simple: 1 Part White Vinegar to 3 Parts Water. That's it.