Water spots are created when drops of water evaporates off the surface of your vehicle. All water contains minerals, including iron and calcium and sometimes salt. Rain water contains all these things plus pollution. When the drop evaporates, these trace elements are left on your vehicle to etch the outline of the drop. They are the reason that water spots are permanent even though water is not. Because the spots are often etched into glass, cleaners cannot remove them. Mckee's 37 high performance glass restorer removes mild etched water spots from glass and restores perfect clarity. The unsightly cloud of water spots that exists on the windshield out of the wipers range can be removed. McKee's 37 high performance glass restorer can also be used to remove water spots, sap, bug splatter and films from chrome and windows. This citrus-based cleaner can safely loosen sticky contaminants so they wipe off easily. Your windshield will be restored to its original clarity.