Water deposits are not only a nuisance but can also eventually lead to damaged windows. Water that contains high mineral contents, especially magnesium and calcium, can leave encrusted water deposits on your windows. After rainfall, water will evaporate from a surface such as a wall or window and leave unwanted deposits behind that are known as calcium or lime scale. You may not notice the building deposits and pass it off as just a dirty window.
Over time, these water stains will build into a thick white layer of crust that makes your windows look and feel cloudy. Water deposits are fairly easy to remove during the early stages, but eventually they etch into the pores of the glass and can become baked by the sun. When tough detergents or window scrapers won’t remove the build-up, you will know it is too late. Here is one natural method you can use to clean hard water stains off your windows:
Fill a bottle with half water and half vinegar. The best vinegar to use is plain white distilled vinegar. Adjust the vinegar to water mixture based on how severe the water stains are- the tougher the stains, the more vinegar you should use. Spray the mixture on the glass, fully saturate any stubborn water spots or areas of concentrated buildup. Allow the vinegar to soak, and reapply a couple of times for particularly dirty areas.
Soak an old towel in vinegar and water, and spread it over the sprayed area of glass. You can allow the towel to sit over the area so that the vinegar can soak in thoroughly.
Use the soaked towel to scrub the glass. Do not scrub too hard. The bumps on the towel should act as an abrasive to help remove the spots and allow the vinegar to penetrate the build-up.
Allow the vinegar solution to sit but re-apply the mix whenever it starts to dry. The worse the stains are, the longer the vinegar will need to do its work.
Remove the vinegar solution with a dry towel. You may want to spray the area once more with your vinegar solution or plain water, then towel off with a clean, dry towel (or paper towel). Be sure you do not allow the vinegar solution or water to dry on the surface of the glass, as this will continue to leave more spots.