I know from washing windows last spring that I have at least 3 Vinyl Windows that have a bad seal, since they looked hazy or dirty, even after cleaning both sides very well.

I was dumb... I didn't tag the windows. I want to get them replaced, but I can't recall which windows are bad.

Is there a way to tell in the winter time (without cleaning test) which windows are bad? It's currently 20-40 degrees outside in my part of the country.

I figured a window with leaky seal might be slightly colder (when measured inside against glass) than others with good seal, or some other scientific approach?

Thank you !