My pool sweep frequently sprays water onto my windows and sliding glass doors. Now, the windows and doors are stained from the chemicals in the pool. Does anyone have a cleaning solution or method that I might use to remove those stains? Thanks.
Jakeatway

I would try "Spray 9" cleaner. If the chemicals actually etched the glass, check with a real glass supplier and tell them the problem. They do have glass abrasives/polishers they may seel to you that would reduce the hazed etched areas. If a razor blade won't take any residue off then its more than likely etched.

Always test cleaners in a small spot first

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Water spots can be tough to remove. Try an once of white vinegar in a bucket of warm sudsy water. Do not try anything abrasive like kitchen cleanser.

Please use COLIN to clean your glasswares like windows & door glasses.

Not familiar with COLIN, what is it?