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Hard water stains are caused by hard water. Hard water contains a lot of minerals, like calcium and magnesium. When water on your glass surfaces dries out, the minerals stay behind and stick to the glass. This results in a residue that looks like white cloudy or streaky spots. Call a pro to install a water softener to banish hard water problems.

If you have a small damaged mirror, chances are it’s better to replace it, as the repair will average around $200, and replacement could cost around the same price. If you’re working with a large mirror—like one over a bathroom vanity or a large floor mirror—or an antique mirror, it’s often more affordable to repair it. Large mirrors can cost hundreds of dollars, and depending on the type of repair you need, you’ll spend just $50 to $200 fixing it, ultimately saving you some money. Antique mirrors might be priceless, so a repair might be the only option.

Smart glass may still work at night, but it depends on the type of smart glass. Some options, smart tint, are controlled by outdoor heat and light and therefore will turn back to transparent at night. Other types can provide a frosted look for some privacy at night. For example, you can turn PDLC smart glass completely opaque any time, day or night.

While finding your mirror cracked can be spooky, there are actually many logical and common reasons why this happens. First, the mirror may have been mounted unevenly in the first place. Over time, poor mounting leads to stress points that will eventually cause a mirror to crack. Other common causes of a mirror spontaneously cracking include dramatic temperature shifts, strong thunder or a loud crash somewhere in the distance, exposure to heat and sunlight, and an uneven wall in your home. It's also possible that your mirror had a manufacturing defect or microscopic cracks that occurred during glass cutting or handling that eventually caused it to shatter.