To clean old windows that have a cloudy film, use Easy Off oven cleaner or any other that has LYE in it. Wet the window pane with wet cloth and spray oven cleaner over area. Leave set a minute or so and wipe off. If the film is not entirely off then repeat or leave on a little longer. I got this tip from a professional window washer. He also stated that a fine steel wool and straight ammonia will also remove the cloudiness from window panes if it isn't inside a double insulated window.
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