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How can I remove hard water stains on my windows?

Asked by 2davidc8 (4967 points ) April 15th, 2014

My windows have what I think are hard water stains along the bottom edge (exterior side only). The fogginess cannot be removed by a simple washing and squeegee.

I suppose something acidic might remove them if they are indeed hard water stains. But I don’t want to use anything that might etch the windows or damage the paint on the walls. So, how can I get clean and clear windows again?

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