How do I get rid of foggy windows in my house?

To get rid of foggy windows, first identify whether the moisture is on the surface or trapped between panes. Then use ventilation, cleaning solutions, or replace the insulated glass unit if the seal has failed.

One morning, I looked out the window and couldn’t see anything—just a blurry white haze trapped inside the glass.

Foggy windows¹ form when moisture collects between glass panes or on the inside surface due to temperature changes or excess humidity. It’s a common issue in kitchens, bathrooms, or homes with poor ventilation.

At first, I tried wiping it off—but the fog didn’t go away. That’s when I realized I needed a better fix.

Can you fix foggy double pane windows?

You can fix foggy double pane windows by replacing the glass unit or using a defogging service² if the seal is only mildly damaged.

If the seal between the glass layers has failed, moisture gets trapped inside. In that case, the only permanent fix is either replacing the insulated glass unit (IGU) or the whole sash.

Some companies offer "window defogging" services where they drill a small hole, clean out the moisture, and insert a drying agent. I’ve tried this once—it helped for a while but didn’t fully restore clarity.

Here’s a comparison of common solutions:

How do you fix foggy windows from the inside?

If fog is on the surface, use vinegar or defogging spray³ to clean the glass from the inside. But internal fog requires professional repair.

I used to think it wasn’t possible—but there are a few tricks that work for surface fog.

Start with a simple mix of vinegar and warm water. Spray it on the inside glass and wipe with a microfiber cloth. For stubborn buildup, I’ve also used toothpaste or baking soda paste. It helps remove mild haze caused by minerals or cleaning product residue.

But if the fog is between two layers of glass, cleaning the surface won’t help. That’s when you need to think about repair or replacement.

How do you remove haze from house windows?

To remove haze from windows⁴, use a mix of vinegar and water, or baking soda paste, to clean off minerals or soap film.

This haze usually builds up slowly. I noticed it most on bathroom and kitchen windows.

Here are the steps I follow:

1. Mix equal parts vinegar and warm water in a spray bottle.
2. Apply to the window and let it sit for 5 minutes.
3. Use a microfiber cloth to wipe in circular motions.
4. For tough spots, apply a paste of baking soda and water.

If haze remains, commercial window polishing creams may help restore the glass. Always test on a small area first.

How do I stop my windows from fogging up in my house?

Reduce indoor humidity and improve airflow⁵ to prevent window fog. Dehumidifiers, open windows, and better glazing help the most.

I used to think fog was a random issue—but I’ve learned it’s about airflow and humidity control.

Here’s what works in my home:

• Open windows regularly to let moisture escape, especially after showers or cooking.
• Use exhaust fans in bathrooms and kitchens.
• Install a dehumidifier if your home tends to trap moisture.
• Keep blinds or curtains open to allow air circulation.
• Upgrade to double glazed low-E windows—they stay warmer and resist condensation.

Fog usually forms when warm indoor air hits a cold window surface. The solution is to either lower indoor humidity or make the window surface less cold.

Frequently Asked Questions

What causes double pane windows to fog up?
Fog forms when the seal between glass panes fails, allowing moisture inside the window.

Is it cheaper to defog or replace a foggy window?
Defogging is cheaper but temporary. Replacing the insulated glass unit is more permanent but costs more.

Can I fix foggy windows myself?
Surface fog can be cleaned with vinegar. Internal condensation usually needs professional help.

Will window film help prevent fog?
Yes, some films can reduce temperature differences and condensation, but won't fix seal failure.

🪟 Need Help Choosing the Right Window?

If you're planning to upgrade your windows or fix long-term fogging problems, feel free to reach out. I’d be happy to help you compare options.

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Conclusion

Clean windows, better airflow, and the right glass help keep fog away for good. Whether you’re cleaning haze or replacing the unit, timely action prevents bigger problems later.