Aquatech's Water Spot Remover For Glass easily removes water spots from glass that occur due to impurities found in water It does not contain harsh chemicals or abrasives that will etch or haze glass. Apply to a small section of glass with a soft cloth or wax applicator using a circular motion. Wipe clean and protect with Aquatech Glass Cleaner and Protectant. Repeat process if necessary. Note: Some water spots that have been on glass for a prolonged period of time may need to be machine buffed. Note: Some spots may be etched in by age and may never totally come out Note: May be used on Lexan or Plexiglass but due to different grades, a small inconspicuous area should be tested first.