I have mentioned this before--and I will again here---take two drinking glasses and keep blowing the vaper in one and cigarette smoke in the other (I had a friend who still smokes do the other glass)--and then take a look at both of them---you will be surprised what you see------Sun
That should be two clear drinking glasses - just wanted to "clear" that up, lol. Had to pick on you, Sun... Somebody's gotta do it!
Back OT, the only thing I've noticed about vaping and windows is that if I exhale directly on a clean window the moisture will coat (fog) the glass in front of me and linger for a few seconds before it evaporates. It seems to evaporate completely. I've taken a tissue and wiped the window afterwards and there was no residue. Proof positive to me that vaping is a heck of a lot cleaner than smoking.
I've done the same thing before (years ago) with analogs. I couldn't see residue on a clean window after a couple of exhales but when wiped with a tissue there was a yellow residue. Similar to blowing smoke through a tissue. Pretty gross when you realize that stuff is sticking to your lungs - yuck!