Last weekend I was in the U.P., I was hunting out of a blind that had Plexiglas windows. One of the days it did not get much above zero and I fought foggy windows all day. Does anybody know of a trick to keep the windows clean? The best I could come up with was to take my heater and hold it close to the window for a few seconds. This seemed to work for about a half hour then the windows would fog up again. It seemed the colder it was the harder it was to keep the windows clean. Wiping them with T.P. only helped for a few minutes and it ran my T.P. rations dangerously low. Something I try not to go hunting without. Back to the question, any tricks would be appreciated.