Hard water stains are a constant battle in the window cleaning industry. They are usually caused by all the minerals in our sprinkler and hose water drying on the glass. They can also be caused by rain water washing minerals off our house and buildings onto the glass.
There are many different ways to restore your windows to their original shine. We can use light abrasives for small stains and deposits. Or, we can be more aggressive with a polisher or even acids on bigger more stubborn mineral deposits.
It is difficult, but usually not impossible to remove those annoying water spots.