Cleaning outside window film??

I live on Lake Erie. There seems to be a film on the outside windows, even when I've used Windex. Does anyone know what will take this off? Also, seems to be a film on outside of my car.

It sounds like the calcium deposits you get from hard water. Try CLR on a clean rag, then rinse with clear water. If you can filter it out or soften it, you should be ok.

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Vinegar might also work?

i use a spray bottle with vinegar and water - windex leaves build up.

I use vinegar and water and dry with a cruppled newspaper, it won't streak.