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Abstract image of streaks and droplets on a glass surface, creating a textured and artistic pattern with a blend of clear and blurred areas.

What Causes Streaks on Windows?

By Window Gang Staff
Published on 10-1-2024

There’s nothing more frustrating than looking out a seemingly clean window and seeing it’s riddled with streaks. Especially after you've put in the time and effort to achieve a spotless shine. These streaks not only detract from the clean appearance of your windows but can also make the job feel incomplete. Understanding the root causes of window streaks can help you avoid them and get the gleaming windows you're aiming for.

Using Too Much Cleaner

One of the most common causes of streaks is using too much cleaning solution. When excess cleaner is applied, it doesn't evaporate evenly, leaving behind a residue that results in visible streaks. To prevent this, use a small amount of cleaner and wipe it thoroughly with a clean, dry cloth.

Dirty Tools

Another culprit is the tools you're using to clean the windows. If you're using a dirty cloth, paper towel, or squeegee, you may be spreading dirt or grime across the glass instead of removing it. Always ensure your cleaning materials are clean and free of debris before starting. Microfiber cloths are particularly effective at capturing dust and not leaving lint behind.

Hard Water

Hard water, which contains high levels of minerals like calcium and magnesium, can cause streaks when it dries on the glass. This is especially true if you're using tap water to dilute your cleaning solution or rinse the windows. To avoid mineral deposits, consider using distilled water or a specialized window-cleaning solution designed to prevent streaking.

Direct Sunlight

Cleaning windows in direct sunlight can cause the cleaning solution to dry too quickly, leaving streaks before you have a chance to wipe them away. Try to clean your windows on cloudy days or when they're in the shade, allowing the cleaner more time to work without drying too fast.

Incorrect Wiping Technique

The way you wipe your windows matters, too. Circular wiping motions can often create streaks. Instead, use vertical or horizontal strokes with a squeegee or cloth, making sure to overlap each stroke to catch any excess cleaner and avoid streaks.

Not Drying Windows Completely

Leaving windows slightly damp can cause streaks to form as the cleaner and water dry unevenly. Always finish the cleaning process by thoroughly drying the windows with a dry, lint-free cloth to ensure all residue is removed.

Window gang has been in the game for a while now, so we understand what causes streaks. We hope after reviewing this article you too have a better understating. By addressing these common causes and adjusting your cleaning technique, you can enjoy crystal-clear, streak-free windows that last longer and enhance the beauty of your home. If you have trouble getting it done, call in the pros and we will happily take care of it for you.