On some of our older machines, we have the rear windows and side windows that are all fogged up and we can't crap see out of them. Has anyone found a good method of restoring the windows to at least be able to see out of them?
Replace then. Buy sheets of Lexan (polycarbonate) and cut them to fit.
Meguiars Plastx is a good and easy product to use, available at your favourite auto store.