Cleaning windows can seem like a simple task, but not all windows—or glass types—are created equal. Whether you’re dealing with modern double glazing or specialised glass like tempered or coated varieties, knowing the right way to clean each type can prevent damage and keep your windows looking their best.
In this guide, we’ll cover how to clean different types of windows and glass effectively, ensuring you always have a clear, streak-free view.
Cleaning Different Types of Glass
Your home or office likely features various types of glass, from standard windows to speciality glass that serves specific functions. Each type requires slightly different care to avoid scratches, damage, or loss of transparency.
Annealed Glass
Annealed glass is one of the most common types used in windows. It’s relatively easy to clean but can still get scratched if not treated properly.
- Prepare a solution of warm water and a small amount of dish soap.
- Using a soft cloth or sponge, gently scrub the surface to remove dirt, dust, and fingerprints.
- Rinse with clean water to remove soap residue, and wipe dry with a microfibre towel to prevent streaks.
Pro Tip: Avoid using abrasive pads or harsh chemicals, as annealed glass can scratch more easily than other types.
Heat-Strengthened Glass
This type of glass is tougher than annealed but can still be vulnerable to scratches, particularly if you use abrasive cleaning tools.
- Use a gentle cleaning solution of soap and water, avoiding anything too acidic or abrasive.
- Apply with a soft, non-abrasive cloth, taking care not to use too much pressure.
- Rinse with clean water and dry with a soft microfibre cloth for a smooth, streak-free finish.
Pro Tip: Never use a razor blade to scrape off stuck-on grime. While heat-strengthened glass is durable, its surface can still be damaged by sharp objects.
Tempered Glass
Tempered glass is commonly used in safety applications, like shower doors or patio windows, as it’s designed to shatter into small, less dangerous pieces if broken. However, it’s also more prone to scratching.
- Use a soft cloth or sponge with warm, soapy water. Avoid using anything abrasive that could damage the surface.
- Clean using gentle circular motions to remove dirt or smudges.
- Rinse thoroughly with water and dry immediately using a microfibre cloth to prevent streaks.
Pro Tip: Tempered glass can withstand temperature changes, but it’s essential to clean it gently. Using harsh chemicals can lead to surface damage over time.
Stained Glass
Stained glass windows are stunning works of art that require special care to maintain their beauty. Regular cleaning helps preserve the vibrancy of your stained glass. Follow these steps to clean stained glass safely:
- Start by mixing a few drops of mild dish soap with warm water in a bucket. Avoid harsh chemicals that could damage the glass or its leading.
- Dip a soft cloth or sponge into the soapy water. Gently wipe the stained glass in soft circular motions to remove dust and smudges. Be careful around the leading and soldering to avoid damaging these delicate areas.
- Rinse the glass thoroughly with clean water to remove any soap residue. Immediately dry the glass with a soft microfibre cloth to prevent water spots and streaks.
Coated Glass
Coated glass has a thin layer applied for UV protection, energy efficiency, or privacy. These coatings can be sensitive, so care is needed to prevent damage.
- Only use water or a very mild soap solution. Avoid any ammonia-based or harsh chemical cleaners, as these can strip away the coating.
- Wipe gently with a soft microfibre cloth to avoid scratching.
- Dry immediately to prevent streaks and preserve the coating’s integrity.
Low-E Glass
Low-E (low emissivity) glass is specially designed to improve energy efficiency by reflecting heat and blocking harmful ultraviolet (UV) rays. This makes it a popular choice for modern homes, as it helps maintain indoor temperatures while reducing energy bills. However, its unique coating requires extra care during cleaning to prevent damage.
Low-E glass typically has a thin, invisible coating applied to one of its surfaces. This coating enhances the window’s insulating properties but can be easily damaged if the wrong cleaning products or methods are used.
- Use a mild, ammonia-free cleaner to preserve the glass’s energy-efficient coating.
- Gently wipe with a soft microfibre cloth to prevent scratching or damage.
- Dry the glass immediately to avoid streaks and maintain the coating’s effectiveness.
Cleaning Different Types of Windows
After covering the types of glass, it’s important to consider the actual window structures, such as double glazing or bay windows, which come with their own unique cleaning challenges.
Double-Glazed Windows
Double-glazed windows are popular for their insulation properties, but they do need proper care to prevent condensation between panes and maintain their appearance. To clean double-glazed windows, mix a mild detergent with warm water and wipe the panes with a soft cloth.
Avoid using too much water, as excess moisture can get trapped between the panes and lead to fogging. After cleaning, use a squeegee or a lint-free towel to dry the glass and prevent streaks. If you notice any condensation between the panes, it could indicate a broken seal, which would require professional attention to fix.
Triple-Glazed Windows
Triple-glazed windows offer even better insulation than double-glazing but can also be prone to streaks if not cleaned correctly. Like their double-glazed counterparts, a simple soap and water solution is usually all you need.
Gently wipe the glass, making sure to dry with a microfibre towel to avoid leaving any streaks behind. Regular maintenance will keep the insulation intact and ensure that the windows remain clear and energy-efficient.
Skylight Windows
Skylight windows can be tricky to clean due to their angle and position, which makes them more prone to collecting dust and debris. For the inside, an extension pole with a soft brush or microfibre cloth can help you reach the glass without risking damage. For the exterior, using a hose with a spray attachment can help remove dirt and dust.
After washing, use a soft squeegee to prevent streaks. Applying a rain-repellent treatment after cleaning can also reduce the need for frequent maintenance by causing water to bead and run off. Cleaning skylights on cloudy days will prevent streaks, as direct sunlight can dry water too quickly.
Bay Windows
Bay windows, with their multiple panes and angles, often require more attention when cleaning. Start by cleaning each pane individually using a mild soap solution and a soft cloth. Using a squeegee will help you reach the awkward corners and avoid streaks.
Don’t forget to clean the window frames and ledges as well, since dirt and dust can easily accumulate in these areas. Pay special attention to the edges and corners, as grime can build up over time and impact the overall appearance. Always dry with a lint-free towel to remove any moisture.
How to Clean Window Frames & Tracks
It’s not just the glass that needs attention. Window frames, tracks and rubber seals often collect dirt, dust, and grime that can affect how well your windows function. Regular cleaning can prevent long-term damage and keep your windows operating smoothly.
For window frames, use a vacuum or small brush to remove dust and debris from the tracks and corners. Then, wipe the frames with a damp cloth and a mild soap solution. If your frames are wooden, be careful not to use too much water, as this can cause the wood to warp or rot over time. Metal frames may benefit from a small amount of lubricant applied to the tracks, which can help keep your windows sliding smoothly.
Cleaning window tracks is equally important. Built-up dirt can cause windows to stick, making them hard to open and close. To clean the tracks, use a small brush to loosen the debris and vacuum it away. Wipe the tracks down with a damp cloth and ensure they’re thoroughly dry to prevent rust or mould from developing.
Hassle-Free Window Cleaning
Cleaning different types of windows and glass doesn’t have to be a daunting task. Understanding the unique characteristics of each glass type—whether it’s coated, annealed, or tempered—and following the right cleaning methods ensures your windows stay in top condition, enhancing both the look and functionality of your home or office.
If you find certain windows difficult to clean or simply don’t have the time, All Clean London offers professional window cleaning services for every type of glass and window style. Contact us today for expert cleaning that leaves your windows sparkling, streak-free, and ready to shine.
