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How to Clean ‘Hard Water Spots’ From Windshields

Water that’s very high in minerals, such as calcium and magnesium, is known as hard water. When hard water evaporates from the windshield surface, it leaves behind the minerals, creating white spots on the surface. These white spots, also called lime scales or calcium deposits, harden over time creating a whitish glaze on the windshield. White spots are extremely difficult to remove and give your car windows an unpleasant haziness and texture. So here are some foolproof ways, to help you get rid of the rigid hard water stains from your windshield.

Vinegar or Lemon Juice

The mineral deposits in hard water are alkaline in nature. The acid in vinegar can help neutralize them. Make a mixture of equal quantities of white distilled vinegar and water. Spray the mixture on the hard water stains on your windshield. Let it sit for 5 minutes, so the acidity of the vinegar can soften the hard deposits. Wipe it off with a clean towel until the spot vanishes. You can repeat the process, if needed. Lemon juice can also be used instead of vinegar, as it has the same acidic properties. Fresh lemon juice can remove hard water stains more easily than the bottled variety. For severe hard water stains, you can rub the lemon directly on the glass.

Essential Oil

Lemon and orange essential oils don’t just remove hard water stains from windshields, but they also prevent them from building up in the future. Add a few drops of orange or lemon essential oil in water. Apply the mixture on the windshield with a clean sponge or towel. Let it soak for about 10 minutes, then clean it with any glass cleaner. You can use this tip once a week, to keep hard water spot from depositing on your windshield.


Toothpaste can also help remove hard water stains. Non-gel fluoride toothpaste has a mild abrasive, which helps in removing hard water stains from windows. Squeeze a small amount of toothpaste on the stains. Spread it all over the affected area with a damp towel. Let it sit for 5–10 minutes, then wipe the toothpaste off with a wet towel or sponge.

Hard Water Cleaner

There are glass cleaners also available in the market, specifically designed to remove hard water stains. Clean the windshield or window with a clean, dry cloth to remove any dust and dirt. Spray the chosen cleaner on a damp cloth or sponge. Rub the cloth or sponge on the affected area in circular motions, until the spot is removed. Wipe the surface clean with a dry cloth.   An unclean and hazy windshield can severely hinder your view while driving. Our professionals at AAR Auto Glass can give your windshield the right treatment. Call us at 832.303.0318 for auto glass and windshield repair and replacement services in Houston.

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