anyone have ideas to get hard water spots off my outside windows?

We were vandelized with paint balls on our house and cars recently. The hose and a brush took most of it off but, now I have hard water spots. I am having trouble getting them off. Anyone have ideas how to get them off for good? Thanks SO much!

Answers:
Zep brand toilet bowl cleaner. Mix it 50/50 with water and clean your windows with it.
Zep is a commercial brand available at Home Depot.

Other answers:
vinegar
vinegar
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