[bobbecky]

The front windows are supposed to be automotive glass, just like in a car or truck, so any window cleaner or even car wash soap, and a scrubber for cleaning glass would be the thing to use. If you can't or don't want to get a ladder out every day, just use one of the window scrubber/squeegees on an extension pole. We have the same issue, only with the fiberglass front cap, and do the same thing.