Hard water not only affects the dishes that are washed in it, but windows as well. Film is the result of excess minerals found in hard water such as calcium and magnesium that cool, dry and adhere to whatever surface it's touching leaving an unclean foggy look. When windows are dirty, or dirty looking, it can make the entire house feel unclean. Removing film from windows is easier than you think and the benefits are worth the extra time.
Mix a solution of equal parts water and vinegar into a spray bottle.
Add a cap full of ammonia and a teaspoon of dish soap.
Spray the window with the solution.
Wipe the window clean with scrunched up newspapers to clean the glass.
Shine the area with a soft, clean towel.