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.

Cleaning your windows not only improves your home’s curb appeal—and, therefore, property value—but it also prolongs the life of your windows. Clean windows make a big difference from the outside, so if you’re selling your home or plan on selling, window washing is an affordable way to make your home stand out. Additionally, cleaning the tracks and moving components in your window can help them last longer, potentially saving you money over time on window replacement costs and repair.

Unless it’s written into the purchase agreement, there’s no legal obligation that a house you’ve bought has to be clean before you move in. The previous owner is generally required to sweep the house, but that doesn’t guarantee everything will be spotless upon your arrival. If possible, discuss the cleaning requirements with the real estate company before moving in.

Clean with a non-abrasive cleaner regularly to prevent soap scum and hard water stains. Use a squeegee after each use.