Double pane windows have multiple advantages, ranging from increased energy-efficiency to improved temperature control. However, it isn’t always mentioned that fog can accumulate between the two glass panes. Fortunately, this blog has all the answers you need to address the problem quickly and effectively. Read on to learn what causes double pane windows to get foggy, how to clean cloudy double pane windows, and how you can prevent the cloudiness from happening in the future.
Why Are My Windows Foggy?

Before learning how to fix foggy windows, it can be beneficial to understand what cause them. This can help you understand and address the issue more effectively.
Here is a list of possible reasons your windows are fogging:
How To Clean Cloudy Double Pane Windows
Here you’ll find a variety of methods on how to clean cloudy double pane windows:
Method 1: Using a Dehumidifier
Dehumidifiers are an excellent tool for fixing cloudy windows caused by overly humid environments. Once the humidity levels are lowered, you should see the cloudiness disappear from your windows. If the fogginess remains following the dehumidification, that may be a sign there’s an additional or different problem.
Tip: Avoid excess moisture while using your dehumidifier by slightly opening doors and windows to keep air circulating.
Method 2: Drilling Small Vent Holes & Applying Desiccant
Eliminate condensation and/or cloudiness within your double pane windows with vent holes. This involves drilling two small holes near the bottom you the window pane, inserting desiccant packs, and resealing the holes with silicone caulk. The desiccants for windows are typically a silica gel pack, which absorbs moisture and keeps your windows free from fog.
Tip: After drilling the holes, use a dehumidifier to remove the moisture between the glass. You can also apply an anti-fog spray inside the holes before sealing them.
Method 3: Window Disassembly & Cleaning
If properly equipped and able, you may consider disassembling your window and replacing the seals or insulated glazing unit (IGU). However, replacing window components without the help of a professional can decrease the effectiveness and energy efficiency of your windows. Cleaning the outside of the windows is another good option. Use a combination of distilled white vinegar and water with a microfiber cloth. Apply gentle pressure and pay close attention to areas with clear fogginess or mineral deposits.
Tip: Carefully scrub the windows with a baking soda and water paste to remove difficult hard water spots. Afterwards, thoroughly rinse the glass with water and dry it with a microfiber cloth.
Method 4: Complete Window Replacement
If the methods above fail to remove the fog from your windows, a complete replacement might be necessary. There may be damages that you cannot see, or the window could have been improperly installed to begin with. Call a glass repair and replacement expert such as Glass Repair Canada for further guidance and assistance.
Tip: Complete double pane window replacements should only be performed by a licensed and experienced professional. DIY installations can reduce the energy efficiency of the window and lead to unintended errors.
How To Fix Foggy Windows
The following is a list of various double pane window repair techniques and best practices that help you fix and prevent foggy glass windows:
Proper Window Maintenance and Sealing Techniques
Wash your windows regularly with mild cleaning products and a soft microfiber or lint-free cloth. Additionally, you should examine your windows every couple of months for wear and tear. If you notice broken seals, be sure to address them as soon as possible to avoid excessive moisture accumulation. Consider applying rain-resistant or water-repellent coatings as well, to help reduce hard water buildup.
Best Practices for Indoor Humidity Control
Here are some best practices for controlling indoor humidity:
When to Call a Professional for Window Repair or Replacement
Cloudy windows can be a sign of a bigger problem, such as a leak, faulty seals, or age-related wear and tear. If you’re having a hard time finding the cause of your foggy windows or you notice visible damages, it’s time to call the professionals. Your windows may need repairs or replacing and the best people for the job are qualified and experienced glass window experts, such as those at Glass Repair Canada.
Final Thoughts
Now that you’ve read the article above, you should have a good idea on how to clean cloudy double pane windows with ease. If you’re still having trouble with cloudy windows after following the cleaning techniques above, you may need foggy window repair services. Call Glass Repair Canada today to receive a free quote!