How to Remove Stubborn Water Deposits from Windows
For facility managers and custodial teams, few cleaning challenges are more frustrating than water deposits on exterior windows. These mineral stains, often caused by sprinkler systems or hard water, do not just dull the appearance of the glass; they create a negative impression for visitors and occupants. Standard glass cleaners are rarely effective against these deposits, making specialized products and techniques essential.
Why Water Deposits Are So Tough
Sprinkler water often contains minerals like calcium and magnesium. When the water evaporates, those minerals remain, leaving behind cloudy spots and streaks. Over time, they can etch into the surface, making removal even harder and possibly causing lasting damage. Standard glass cleaners are not always strong enough to cut through these deposits.
The Right Way to Clean Water Spots
Most glass manufacturers recommend using an abrasive cleaner for tough mineral stains. One highly effective solution is Hillyard Crème Clean, which contains a fine abrasive similar to jeweler’s pumice. It is designed to handle stubborn buildup without damaging surfaces when used properly.
Step-by-Step Process
- Pre-test first. Always test Crème Clean on a small, hidden section of glass to ensure it will not scratch.
- Apply generously. Put a liberal amount on a damp cloth or sponge.
- Work in circles. Rub the glass in a tight circular motion to break down deposits.
- Rinse thoroughly. Wipe away residue with a clean, wet cloth. Never allow the cleaner to dry on the glass.
- Finish with Windo-Clean®+. Use Hillyard Windo-Clean+
and a Specialty Glass Microfiber Cloth or squeegee to polish and remove any haze.
Pro Tips for Better Results
- Avoid tinted windows: Never use abrasive cleaners on glass with aftermarket tint films.
- Pick the right day: Clean on cloudy, cooler days to prevent products from drying too quickly in the sun.
- Use microfiber: A glass microfiber cloth ensures a streak-free finish.
- Finish strong: Use Windo-Clean®+ and a glass microfiber or squeegee to remove any streak of glass haze markings.
Bringing Back the Shine
Water deposits do not have to ruin the view. With the right products, a little elbow grease, and smart cleaning techniques, windows can be restored to crystal-clear perfection. Next time those water spots appear, you will know exactly what to do.
Talk to Hillyard for More Cleaning Tips
Hillyard has representatives located throughout the United States who are cleaning experts and ready to help with your toughest challenges. Whether you need advice on solving specific cleaning problems or want to lower your total cost of cleaning, we are here to help. Use the "I’m Interested" form at the bottom of this page and we will get in touch with you.
Frequently Asked Questions
What causes water spots on windows?
Water spots are caused when mineral-rich water, such as hard water from sprinklers, dries on the glass and leaves calcium and magnesium deposits behind. Sunlight and heat can bake these deposits into the glass, making them especially difficult to remove.
What if the water spots have been on the glass for years?
Older, baked-on deposits may require multiple applications and extra effort. Using Crème Clean with consistent circular motion will gradually remove deposits.
How do I remove water spots from aftermarket tinted film?
Do not use abrasive cleaners like Crème Clean on aftermarket tinted film. They can scratch or damage the tint. Check with the tint manufacturer to avoid damaging your film.