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How to clean hard water spots off windows
Fill a squirt bottle with half water and half vinegar.
The best vinegar to use is plain white distilled vinegar, which is inexpensive and effective. A higher concentration of vinegar may be even more effective, so adjust the vinegar to water ratio based on the severity of the water spots.
Spray the vinegar solution on the glass. Spray the solution on the glass, being sure to fully saturate any stubborn water spots or areas of concentrated buildup.