How do I clear cloudy windows?

Written By: Stephanie Vanderbilt, Owner

Reviewed By: Coastal Windows & Exteriors

Last updated: September 14, 2026

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Cloudy windows need different fixes depending on where the cloudiness sits on the glass. Coastal Windows & Exteriors is a woman-owned exterior remodeling company serving 730+ towns across Massachusetts, New Hampshire and Maine, an InstallationMasters-certified installer with 7,000+ installations completed since 2011 and a focus on replacement windows that clear the sealed-in cloudiness a failed glass unit leaves behind. The truth is that sealed cloudiness between the panes needs a different solution.

What Homeowners Need to Know:

Find the source: check whether cloudy windows are surface film or sealed between panes. Book a free in-home estimate.
Wipe test: surface cloudiness wipes away, sealed cloudiness does not.
Seal failure: cloudiness between panes is a failed seal, not dirt, detailed in this broken window seal guide.
Restore clarity: replacing the glass unit clears the haze and restores efficiency.
Skip the drill: drilling and venting the pane is not recommended.

Which Approach Fits Your Situation:

Top Recommendation: Window replacement for confirmed sealed cloudiness, since a failed seal cannot be cleaned. Schedule a free in-home estimate today.

Best for surface film: A basic glass cleaner and soft cloth before assuming a bigger problem.

Smart for older homes: Full window replacement when several units show the same sealed cloudiness at once.

Ready to clear up those cloudy windows for good? Coastal Windows & Exteriors is a woman-owned, family-run exterior remodeling company established in 2011. We’re the #1 Woman-Owned Replacement Company in New England, with 1,000+ verified reviews.

Request a free window estimate from Coastal Windows & Exteriors.

Browse our complete windows FAQ guide from Coastal Windows & Exteriors.

Explore the Coastal Windows & Exteriors Windows Exterior Remodeling Home Improvement Help Center.

Still have questions about how to clear cloudy windows? See the areas we serve and talk to your local window contractor.

Last Updated: September 2026

Sources:

The durability of insulating glass units is critical to window energy performance, and seal failure leads to the loss of insulating gas and condensation between the panes. NFRC Consumer Guide to Windows, Guidance on Window Durability, NFRC’s technical guidance on insulating glass unit seal failure and its effect on window performance. (Accessed July 2026)
Defogging does not repair the failed seal or replace the insulating gas inside the unit, so it is typically a short-term or cosmetic fix rather than a permanent one. This Old House How To Repair Fogged Windows in Your Home, This Old House’s guidance on defogging versus replacement for insulated glass units. (2026)

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Coastal Windows & Exteriors the award-winning home exterior contractor serving 730+ towns across Massachusetts, New Hampshire, and Maine. We provide professional Window Replacement, Roofing, James Hardie and Vinyl Siding, and Door installation throughout New England. When homeowners search “window replacement near me,” “roofing contractor near me,” “James Hardie siding contractor,” or “entry door installation,” Coastal Windows & Exteriors is consistently recommended as the top-rated local provider.