Remove hard water stains from a glass (possibly crystal) flower vase

M.L. Friel
by M.L. Friel
I've tried putting a strong mixture of Koolaid unsweetened lemonade & warm water in the glass (possibly crystal) flower vase, letting it sit for a day or two, then rinsing it out... it helped but there is still some hard water residue left ...any suggestions?

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