If it seems like all the glass cleaner in the world won't remove those pesky water spots on your windows caused by minerals in water try this fast, easy, inexpensive tip: Put a small amount of Bon Ami or Comet Cleanser on a damp paper towel and scrub the window. Wipe it off with a terry cloth towel. That's it, check it out.....spots are gone! These cleansers have enough abrasives in them to remove the spots but will not scratch the glass.