Would rubbing vinegar on my windows prevent condensation?

Depends. Vinegar itself is an exceptionally useful (if somewhat smelly) cleaning agent, as opposed to a de-misting agent. If you are going to do this use Apple Cider vinegar. Diluted with one part water and two to three parts apple cider vinegar, use this solution in a spray bottle. The acidity will prevent mist from forming and also double as a useful cleaning solution.

There are commercially available sprays and bottle sprayers for windows to prevent condensation too, usually found in any car shop or in the auto care section of a general store. You can use vinegar on windows to stop condensation too, its a simple mix of two parts water, one part white vinegar. Its a very effective alternative condensation spray for windows in cold weather.

Vinegar can stop condensation on windows, however its a very messy and kinda smelly solution. Professional and cheap solutions can be found almost anywhere that can do a better job. In a pinch or emergency, dilute vinegar into water and spray it on the windows, that will help.

The acidic nature of vinegar is what makes it so helpful for removing stains from foggy headlights. But it's not very effective for preventing windows from fogging up. Why My Car Windshield Fogs Up? 7 Ways to Solve IT 
You can try the methods here, I just used these ways to solve my car window fogging problem. Grateful!