I bought a new 75 gallon fish tank and it has hard water stained

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I bought a new 75 gallon fish tank and it has hard water stained on the outside glass. I've tried CLR and vinegar and neither worked. Any other suggestions or is this

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I bought a new 75 gallon fish tank and it has hard water stained on the outside glass. I've tried CLR and vinegar and neither worked. Any other suggestions or is this

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