Hard water is water with higher-than-usual mineral content. Hard water contains calcium and magnesium ions. Hard water stains occur when hard (mineral-rich) water evaporates, leaving a grimy residue on your surfaces. Most commonly, you’ll find hard water stains in the bathroom on glass, porcelain, tile and metal surfaces. You may also find hard water stains on your dishes and clothing.
Did your once bright white tub or shower slowly become stained and dingy? Do you scrub and scrub the dirty areas with no luck? Most likely the culprit responsible for your persistent shower grime is hard water stains.
It's not harmful to your health, but hard water does make soaps and detergents less effective. Your dingy tub doesn't have to be a permanent change; you just need to know how to remove hard water stains. If you're wondering how to clean hard water stains, you can solve the problem with several natural cleaners.
You can also try removing hard water stains with a paste made from baking soda and vinegar.
Finally, you can try removing hard water stains using lemon juice.