It’s hot and humid here in Illinois. Yesterday my wife was driving early in the morning with the AC on, and the windshield was fogging up on the outside. A pattern of spots showed up, and they persist after the wipers pass over the glass. They don’t show up when the glass is dry, but on washing with windex they show up as the surface approaches dry.
Are these waterspots? Are they something else, like wax or oil? This is a 2010 matrix which we bought used about a month ago, so I don’t know its car-washing-history, but it resided in Florida as a rental, I believe.
Or is there something else possible? Can the glass have gotten “de-laminated” enough to have some internal fogging?