How to Remove Hard Water Spots From Car Windows

    Have you ever seen a car with the windows looking like they’re covered in frost? This is hard water. Hard water occurs when rain or sprinkler systems hit your car and then dry, leaving behind minerals as the water evaporates.

    Clean car windows will not only make your car look better but also help you drive better. When driving there is no room for water spots, residues and haze limiting your Vision, and jeopardizing your personal safety and that of your family and other road users.

    Water spots can build up on your car windows to the level of affecting visibility when you need to use side mirrors, windshield and rear glass.

    If you find yourself with hard water spots on your windshield or other glass surfaces in your vehicle, try these tips to keep them away for good.

    Causes of Hard Water Spots on Car Window

    #1. Rain and Acid Rain

    Acid Rain – acid rain reacts with airborne pollutants like sulfur dioxide from power plants causing it to dissolve into droplets of acidic precipitation; ultraviolet radiation breaks down organic matter (such as leaves) releasing chemicals called ketones.

    This reacts with the glass surface resulting to the formation of the opaque or brownish water spots.

    Rain – your gutters could be leaking rain water from the roof onto the window glass causing stains and hard water spots on your car windows.

    #2. Hard or Well Water

    Hard tap or Well water. When hard or well water dries up, minerals such as calcium carbonate and magnesium sulfate mix together with air particles left behind by evaporated moisture in droplets.

    They may form large deposits on your car glass surfaces like windshield, sunroof, and also the rear, front and back car windows.

    #3. Minerals and Alkali Deposits

    Minerals – hard water spots are caused by minerals like calcium and magnesium present in water. When the car windows are wet, the water evaporates but leaves the mineral deposits behind.

    Sprinklers and Car Washes – these also cause hard water spots to form on car windows. They cause alkali deposits that require an acid to remove them.

    #4. Other Causes

    Lack of Factory-Applied Treatments that help prevent water spots on windows.

    Low Quality Window Tint – most low quality tints, allow moisture and water vapor to penetrate the film. The water reacts with the chemicals elements in the tint film and form water spots. 

    If the spots are left unattended, permanent stains could form which are harder to remove. If is therefore important to clean hard water spots as soon as they form. 

    Get Hard Water of Car Windows – Using Home Based Cleaning Products

    #1. Vinegar and Water Solution

    Vinegar is a great natural cleaner and disinfectant because it’s made from acetic acid. The acidity in the vinegar is used to dissolve mineral deposits, dirt, grease and grime, leaving surfaces clean and germs free.

    To remove hard water of car windows using vinegar:

    1. Spray the glass with the solution which contains equal parts water and white distilled vinegar.
    2. Thoroughly saturate the areas with the most prominent buildup then allow the solution to sit for a few minutes, re-spraying the glass as it dries.
    3. Use a small, rough towel that is wet with the vinegar and water solution to scrub the glass.
    4. Dry the window with a soft cloth or paper towel.
    5. You can repeat the process if necessary until the window is completely free of stains.

    #2. Baking Soda and Water

    Baking soda is a great cleaning agent because its a mild alkali. It causes dirt and grease to dissolve in water, so it is very effective in cleaning numerous glass spots and stains, especially the hard water spots on car windows.

    In this method:-

    1. Mix baking soda and a small amount of water to make a paste.
    2. Apply the paste using a piece of cloth to the area to be cleaned and scrub the window vigorously. This allows the abrasive granules of baking soda to remove the hard water spots.
    3. Thoroughly rinse the glass with water and use traditional glass cleaner and a newspaper thereafter to remove all residue and streaks from the window.

    Arm & Hammer Baking Soda – 64 Oz

    • Arm & Hammer baking soda is made from pure, safe and natural ingredients. This means it does not contain any industrial chemicals that may harm your car surface.
    • It has a dozen of cleaning uses including Kitchen and bathroom cleaning, Laundry cleaning and Deodorizing. Be sure that the bird poop stain will be thoroughly cleaned.
    • Is guaranteed to absorb and eliminate odors on contact without corroding the cleaned surface.


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    #3. Lemon

    The citric acid in lemons is has antibacterial and antiseptic properties, and it acts as a natural bleach. 

    The natural acidity in lemon therefore, helps to remove hard water stains in car windows with ease. The citrus smell of lemon is refreshing and invigorating to the surface to be cleaned.

    Cleaning Steps:- 

    1. Use a lemon that is sliced in half and rub it on the glass with a fair amount of pressure.
    2. Use a soft cloth or paper towel to clean up the lemon juice residue.
    3. Finalize by spraying the glass with a glass cleaner and wipe it away with newspaper for a streak-free shine.

    Get Hard Water of Car Windows – Using Store-Bought Cleaning Products

    #1. Duragloss Automotive Glass Water Spot Remover (Best Overall Hard Water Spot Remover)

    Duragloss is a very reputable brand well-known for manufacturing and distribution of automotive cleaning and polishing products.

    This spot remover specifically is specially designed to remove water stains, bugs, tree sap and other types of dirt from your car window. The product is formulated with a lubricant that helps prevent abrasion scratches.

    How to use:

    1. Apply Duragloss  Automotive Glass Water Spot Remover by hand or with a buffer on the stained area.
    2. If applying by hand, use a polyfoam applicator.
    3. Once you’ve polished your vehicle’s glass, use Duragloss rain repel, to seal and protect the glass from future water spot stains.

    Duragloss Automotive Glass Water Spot Remover

    • Duragloss nu-glass is a safe, practical glass polish that really works.
    • Safely removes water spots, Bug, Tree Sap and other stubborn glass stains without harming the glass itself.
    • Duragloss nu-glass is a safe way to polish glass without scratching, distorting or damaging the glass.
    • It contains lubricants to protect the glass from abrasion. 


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    Duragloss Rain Repel (Water spot Prevention Agent)

    • After using the Duragloss Automotive Glass Water Spot Remover, add Duragloss 751 Rain Repel to your windshield washer reservoir. This will prevent the reoccurrence of water spots on your windshield.
    • A pH-balanced blend of cleaners and siloxanes which cleans glass surfaces while imparting a water-repellent treatment.
    • It can also be diluted 4:1 with water and added to windshield washer reservoir.


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    #2. Meguiar’s Water Spot Remover (Best for Acid Rain Water Spots)

    Meguiar’s is a well-known brand that is trusted by most automobile and Boat enthusiasts. The product is specifically trusted for removing of any types of water stains on your car glass. It is also safe to use on hard plastic, paint, chrome and all metal surfaces.

    How to use:

    1. Shake product well before use.
    2. Spray the water stain remover on a cool surface and let penetrate for 10-20 seconds.
    3. Wipe clean with a Microfiber Towel or 100% cotton cloth towel.
    4. Ensure the glass dry’s completely. Do not let product self-dry.

    Meguiar’s Hard Water Spot Remover

    • Effectively removes Hard Water spot stains on Both Cars and Boats
    • Can also be used to remove acid rain water spots and other glass stains that occur on coastal climates.
    • Advanced polymer protection boosts existing wax protection, intensifies water beading and minimizes future water spotting
    • Easy spray-and-wipe formula, hard scrubbing is not required


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    #3. Hot Sauce Premium Hard Water Spot Remover (Most Environmentally Friendly)

    This is a biodegradable product that is formulated for removal of water stains, exhaust residue and scum line from your vehicle’s exterior.

    The best feature about this product is the additional wax sealants that help to keep your car’s finish sparkling clean and glossy.

    Hot Sauce Premium Hard Water Spot Remover

    • Ultimate hard water spot remover with high gloss wax sealants
    • Bio-degradable, safe, soft-water based detailer; spray on, wipe off application
    • Removes hard water spots, scum line, and exhaust residue
    • Will NOT strip your current wax, adds additional wax sealants with each use
    • Perfect for autos, watercraft, RV’s, campers, motorcycles, ATVs, and more


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    Final Word

    I’m very cautious when it comes to car windows. If you see those hard water spots and don’t take care of them, they can really cause problems for the visibility of your vehicle! Not only that clear car windows will enhance your safety on the roads.

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