
Double-pane windows are aesthetically pleasing and energy-efficient, but they can be challenging to clean. The process of cleaning double-pane windows differs from that of single-pane windows due to their unique construction. Double-pane windows consist of two panes of glass separated by an airtight seal, trapping air or gas, which aids in insulation and maintaining a consistent temperature. When the seal is intact, no moisture or dirt can get between the panes, and standard window cleaning techniques can be used on the interior and exterior glass. However, if the seal fails, condensation, dirt, or streaks may appear between the panes, requiring a different approach to cleaning. While professional cleaning services are recommended, there are also DIY methods, such as drilling holes and using desiccants or alcohol solutions, but these carry the risk of damaging the windows.
Can the inside of double-pane windows be cleaned?
| Characteristics | Values |
|---|---|
| Professional cleaning | Recommended |
| DIY options | Drilling holes, using a fan, dehumidifier, water snake, vacuum cleaner, glass cleaner, resealing, replacing windows |
| Drilling holes | Risky, may damage glass, may ruin efficiency of window |
| Quick fixes | Temporary, may not fix the issue |
| Seal | May break, may need replacing |
| Commercial cleaning services | Available |
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What You'll Learn

Drilling holes to clean double-pane windows
Drilling holes in double-pane windows is a temporary solution to access the interior for cleaning before a full replacement is required. This method should only be used if you are confident with a power drill, as drilling holes can be dangerous and may damage the glass.
If you are willing to attempt this method, you will need to drill one or two small holes, 1/4 inch into the window seal, about 2 inches away from the corner. You can then place a small dessicate packet inside the gap to absorb moisture. The holes will also allow you to remove fog and rinse out the window with rubbing alcohol to remove any remaining dirt.
It is important to note that drilling holes will reduce the energy efficiency of the window, as the insulation will no longer be effective. Additionally, this method will not fix the issue of a broken seal, and the window will likely need to be replaced in the future.
If you are hesitant about drilling holes, there are alternative methods to clean double-pane windows. One option is to use a vacuum cleaner with a brush attachment to remove loose dust and debris from the interior surface of the windows. You can then prepare a gentle glass cleaning solution by diluting it with distilled water and spraying it onto the interior surface of the glass. Another alternative is to use a dehumidifier near the window to remove moisture. However, if there is dirt trapped inside the window, drilling holes or hiring a professional may be necessary.
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Using a dehumidifier to remove moisture
Double-pane windows are a popular choice for energy efficiency and improved insulation. However, they can develop moisture problems over time, which can affect their appearance and functionality. This happens when the seal between the panes fails, allowing moisture to enter the space between the glass. This can lead to foggy windows, reduced visibility, and potential damage to the window frame.
One way to address this issue is by using a dehumidifier to remove moisture from between the panes. Dehumidifiers are electrical appliances that reduce and maintain the level of humidity in the air. Here are some tips on using a dehumidifier to remove moisture from double-pane windows:
- Place the dehumidifier near the window: Position the dehumidifier in front of the window with the inlet facing the window. This will help draw out the moisture from between the panes.
- Run the dehumidifier for several days: Depending on the severity of the moisture buildup, you may need to run the dehumidifier for a day or several days. It is recommended to use the dehumidifier until the condensation is cleared.
- Maintain proper ventilation: Ensure proper ventilation in the room to minimize moisture buildup. Use exhaust fans in high-humidity areas like bathrooms and kitchens to reduce moisture and control indoor humidity levels. Aim to maintain indoor humidity between 30% and 50% to reduce condensation.
- Combine with other methods: For a more comprehensive approach, combine the use of a dehumidifier with other methods such as applying gentle heat with a hair dryer or space heater, or using moisture absorbers along the bottom edge of the window. These additional methods can help speed up the moisture removal process.
- Prevent future moisture issues: After removing the moisture, take preventative measures to avoid future problems. Regularly inspect your windows for any signs of wear or damage, especially the seals and frame integrity. Replace any damaged sealant or weather stripping to maintain the integrity of the window panes.
While using a dehumidifier can be an effective temporary solution, it is important to note that it does not address the underlying seal failure causing the moisture problem. If the issue persists or becomes severe, it is recommended to consult a professional for proper diagnosis and window replacement or resealing if needed.
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Resealing windows to prevent condensation
Double-pane windows are made of two panes of glass with an airtight seal between them. This seal locks in air, acting as an insulator and keeping the house warm in winter and cool in summer. However, over time, the seal can become damaged, allowing condensation and dirt to seep in.
If you notice condensation between the glass panes, it is likely that the window seal has failed. This happens when the insulating gas escapes, allowing moisture to infiltrate the space between the panes. The solution involves refilling the space with insulating gas, usually argon or krypton, and repairing or replacing the seals. While this is a cheaper and more environmentally friendly option than replacing the entire unit, it is not a permanent solution.
Before attempting to reseal your windows, it is important to determine whether the seals are too damaged and if replacement is a better option. If you feel drafts coming from your windows, it is a sign that your window seals need resealing. Resealing your windows will improve energy efficiency, helping to maintain a comfortable temperature and saving money on energy bills.
To prevent condensation on your windows, you can improve air circulation by trimming vegetation and ensuring clear gutters and downspouts. Applying a water repellent to the exterior of your windows can also help, as it encourages water droplets to roll off the surface. Controlling indoor humidity is crucial, and you can maintain ideal humidity levels by using a humidifier or dehumidifier.
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Cleaning the exterior of double-pane windows
Double-pane windows are made from two panes of glass sealed together with a particular gas or plain air in between. When functioning properly, they offer excellent insulation, and no moisture or dirt can get between the two glass panes. This means cleaning the interior of the inside pane and the exterior of the outside pane will give you clear windows.
If your double-pane windows are functioning properly, you can use standard window cleaning techniques on the exterior glass of your window to achieve a professional-level clean. This means washing your windows with a standard solution, a scrubber tool, and a squeegee.
Begin by using a vacuum cleaner with a brush attachment to remove any loose dirt, dust, or cobwebs from the window frames and sills. Then, using a hose or bucket of soapy water, wash the exterior surface of the windows with a soft sponge or cloth. Rinse thoroughly with clean water and dry with a lint-free cloth.
If you have double-hung windows, to clean them on the outside, you must unlock the top latch and slide the window pane down. Now reach out and use a u-shaped pole and scrubber to clean the exterior glass. Unlatch the bottom lock and slide the lower window up to access more exterior glass and repeat this process. You will struggle to clean all the glass this way. It’s best to clean these windows from the exterior of your home, using a ladder or an extension pole.
If your double-pane windows are not functioning properly, you may need to hire a professional to clean and reseal them.
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When to call a professional window cleaner
Double-pane windows are made of two panes of glass with an airtight seal between them. This seal is designed to lock the air in, acting as an insulator and keeping your home warm in winter and cool in summer. When double-pane windows are functioning properly, they offer excellent insulation, and no moisture or dirt can get between the two panes.
However, over time, the seals can become damaged, allowing condensation and dirt to seep in. If you notice any of the following issues, it may be time to call a professional window cleaner:
- Moisture between the panes: If you see condensation or watermarks between the panes of glass, it indicates a broken seal. While you can try to remove the moisture using a dehumidifier or a moisture absorber, professional assistance is often required for window replacement or seal repair.
- Dirt between the panes: If dirt or dust has accumulated between the panes, it means the seal is broken. In this case, drilling holes to clean the inside of the window is not recommended as it can damage the glass and reduce the window's efficiency. Instead, consult a professional for proper diagnosis and window replacement if needed.
- Foggy windows: If your double-pane windows are consistently foggy, it could be due to broken seals or high humidity in your home. Running a dehumidifier near the window for a few days can help alleviate the issue. If the problem persists, seek professional help for further assessment and possible window replacement.
- Difficult-to-reach windows: If you have high or hard-to-reach windows, it is advisable to call a professional window cleaner. They have the necessary training and equipment to safely access and clean these windows, ensuring a thorough and streak-free finish.
- Old windows: Cleaning very old windows can be challenging due to the build-up of grime and dirt over the decades. Professional window cleaners have the expertise and tools to effectively clean older windows, using powerful cleaning solutions and specialised techniques to restore clarity and extend the lifespan of the glass.
- Seal maintenance: The seals around your double-pane windows require regular inspection and maintenance. Look for cracks, gaps, or peeling sealant. Professional window cleaners can provide periodic inspections and maintenance, helping to identify and address any issues early on, preventing more significant problems down the line.
Remember, while there are DIY methods to temporarily address issues with double-pane windows, consulting a professional window cleaner can ensure a thorough and lasting solution. They have the knowledge and equipment to properly diagnose and address any problems, helping to maintain the functionality, clarity, and longevity of your windows.
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Frequently asked questions
If your double-pane windows are foggy or dirty, it means the seal is broken and they need to be cleaned or replaced.
If your windows are functioning properly, you can use standard window cleaning techniques on the interior and exterior glass. If the seal is broken, you can either hire a professional or try a DIY method such as drilling holes and pouring in isopropyl alcohol.
Apart from drilling holes and pouring in isopropyl alcohol, you can also use a dehumidifier, a water snake, or a fan pointed at the holes.











































