Re: Glass ?
75% white vinegar and 25% water + 100% elbow grease will cut the deposit.
Thiss is what we do to clean hard water stains on fish tank glass. Lime said soak towel and let sit wet on the glass. I use a razor blade and jever had a problem, just make it us always a sharp edge and use one of those blade holders because vinegqr in a cut burns real bad.
Good luck.
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