Short answer: post-construction window cleaning costs more than a routine clean only when the residue is bonded across most of the glass. Our October 29 job in Wilmette shows it: 55 windows inside and out after a renovation, plus 25 screens, 8 storm windows and every track and frame, came to $806. That’s $14.65 a window, close to our 2026 median for any inside-and-out job.

When the contractors leave, most homeowners expect the windows to need a good wash. What they don’t expect is glass that a normal wash can’t fix: a gray film of fine dust that smears instead of rinsing, little dots of glue from labels and tape, and grit packed into every track. This post walks through the Wilmette job: what was on the glass, how we got it off, what the $806 covered, and how it compares with the other post-construction cleanings we did in 2026.

The Wilmette Job: 55 Windows After a Renovation

Most of the glass carried the usual residue of a renovation, a fine dust that had settled on every pane and then been fixed in place by humidity and condensation. On several panes it was worse. Adhesive residue and fine debris had bonded to the glass, and that kind of buildup does not come off with soap and a squeegee.

Paul worked steadily through both floors and wiped the tracks and frames room by room. Where residue had bonded to the glass, he scraped before squeegeeing. That order matters. If you squeegee first, you drag loose grit across the pane, and grit is what scratches glass. The screens went through a full wash, and the 8 storm windows were cleaned on their own, since storms come out and need separate handling. Six hours after starting, the job was done.

The on-site video, all six photos and the crew details are on the full Wilmette project page.

What Construction Leaves on Your Glass

Post-construction residue is not one thing. On the jobs we’ve done this year, it has come in a few distinct forms, and each one is handled differently:

• Fine dust. Drywall sanding, cutting and demolition dust settles on every surface, including the glass. It looks harmless, but it is gritty. Wipe it dry and you are sanding the window.
• Adhesives. Manufacturer labels, painter’s tape and protective film all leave glue behind, and sun and time make it harder to remove.
• Paint and caulk. Overspray, drips and silicone smears from trim work and sealing.
• Mortar and masonry haze. On exteriors where brick or stone work was done.

Here is how we approach a pane like that:

1. Look before touching. Check the glass in raking light for existing scratches, coatings and stickers that say what kind of glass it is.
2. Soak it. Wet the glass thoroughly with cleaning solution so the dust floats instead of grinding.
3. Lift what’s bonded. Remove adhesive and stuck-on debris, with a blade only where the glass and the residue allow it (more on that below).
4. Wash and squeegee. Only once the surface is free of grit.
5. Finish the frame. Vacuum and wipe tracks and frames, then wash screens and storms before they go back in.

Where the $806 Went

Our itemized invoice isn’t public, but the job lines up closely with our published window cleaning prices:

This is our breakdown of the total against the published price list, not the line items from the invoice. The scraping figure is what’s left after the other items.

The surprise is how little of the bill the construction mess accounted for. The razor work was roughly a tenth of the total. Most of the money went to the add-ons that come with a thorough job on an older house: tracks and frames on every window, plus screens and storms. Per window, it worked out to $14.65. The median across the 60 inside-and-out jobs we published this year is $14.02.

Five Post-Construction Jobs From 2026, Side by Side

Of the 145 window cleaning jobs we have published so far in 2026, the crew’s notes flag construction residue on 5. That’s about 1 job in 29.

The Chicago job in September is the one to compare against. It had fewer windows than Wilmette but cost $446 more, about $25 a window, because every one of the 50 needed blade work before it could be washed. On the Woodstock new build, the crew decided not to scrape at all. They lifted the film with solution and careful squeegee work instead.

Five jobs is a small sample, and they are homes that called us, so take the numbers as examples rather than averages. The pattern, though, is consistent with what we see every season. What drives the price is how many panes need scraping, not the fact that there was construction.

Should Anyone Take a Razor to Your Windows?

This is the question homeowners should ask about any post-construction clean, and the honest answer is: sometimes, carefully, and not on every kind of glass.

Glass makers are blunt about it. Cardinal, one of the largest makers of insulating glass for residential windows, says in its January 2026 glass cleaning bulletin that using metal blades on a large part of the glass is a common mistake, and that its warranties do not cover scratching.

“Cardinal recommends metal blades never be used to remove materials from glass surfaces.” — Cardinal IG Company, Technical Service Bulletin IG12, January 2026

There are real reasons for that. Some tempered glass leaves the factory with tiny specks of glass fused to its surface, called fabricating debris. A blade can catch one and drag it across the pane, leaving a scratch you can’t undo. Some glass also has coatings on its exposed surfaces, and a blade can damage them.

So scraping is a judgment call made pane by pane. Here is how we make it:

On the Wilmette house, the blade went on the panes with bonded adhesive and debris. Everything else got a wash. That is also why the scraping came to roughly $76 and not several hundred dollars.

Renovating in Wilmette? Two Things to Check First

Before You Book a Post-Construction Window Cleaning

A few things you can do so the clean goes faster, costs less and doesn’t damage anything:

• Wait for the last trade. Book after the painters, the drywall sanding and the final caulking are done. Cleaning between trades means paying twice.
• Don’t dry-wipe the glass. Construction dust is grit. A dry rag or paper towel turns it into sandpaper.
• Don’t scrape it yourself. Especially on new windows, where a scratch can also mean an argument about the warranty.
• Keep the window labels or photograph them. They tell us the brand and often the glass type, which shapes how we clean it.
• Look for scratches first. Check the glass in low sun before anyone cleans it. Scratches left by construction are easier to sort out with the contractor while they’re still on the job.
• Count windows, screens and storms. That is what the price is built on, so a count gets you an accurate quote on the phone.

If you’re in Wilmette or nearby, our window cleaning in Wilmette page covers service in the area. For more on how pros approach glass, see what professionals use to clean windows. Once the construction residue is gone, our guide on how often to clean windows will help you keep the glass that way.

Just finished a renovation? We’ll check the glass first, clean every window inside and out, and tell you before we put a blade on anything. Every price is confirmed with an on-site estimate you approve before work starts. Call (847) 297-4492 or book online, and check our current coupons before you do.

Frequently Asked Questions

How much does post-construction window cleaning cost?

On our October 2026 job in Wilmette, cleaning 55 windows inside and out after construction, plus 25 screens, 8 storm windows and every track and frame, cost $806. The five post-construction window cleanings we published in 2026 ranged from $182 to $1,252. The biggest factor is how many panes need scraping: a Chicago home where all 50 windows needed blade work cost about $25 per window, while the Wilmette home came to about $14.65 per window.

Is it safe to use a razor blade on window glass?

Not as a general cleaning tool. Glass makers such as Cardinal recommend never using metal blades on glass and do not cover scratching under warranty. Some tempered glass carries tiny fused glass particles that a blade can drag into a scratch, and some glass has exposed coatings a blade can damage. Professionals who do scrape should limit it to bonded paint or adhesive on plain glass, keep the glass wet, use a fresh blade in one direction, and stop if the blade feels gritty.

How long after construction should I wait to get windows cleaned?

Wait until the last trade is finished, including painting, drywall sanding and final caulking, and for exteriors any masonry or landscaping work. Cleaning between trades usually means paying for a second cleaning when the next crew leaves more dust behind.

Can construction dust scratch my windows?

Yes, if it is wiped off dry. Drywall and cutting dust is gritty, and a dry rag or paper towel drags it across the glass. Soak the glass with cleaning solution first so the dust lifts off instead of grinding.

How do I get sticker residue off new windows?

Check the window manufacturer’s cleaning instructions first, because some glass has coatings that limit what you can use. In general, peel labels promptly and not in direct sun, soften the adhesive with soapy water, and avoid metal blades. If residue is still bonded after that, have a professional assess the glass before anyone scrapes it.

How long does post-construction window cleaning take?

Our Wilmette job, with 55 windows inside and out plus screens, storm windows, tracks and frames, took one technician six hours. Construction residue adds time because bonded spots have to be lifted before each pane can be washed.