Should I clean new construction windows before or after removing protective film?

You should always clean the glass after removing the protective film, not before. Getting the order wrong is an easy sequencing mistake during post-construction cleanup, and it can make extra work for you. The protective film is there specifically to shield glass from construction debris, paint overspray, mortar splatter, and dust during the building process, so cleaning over top of it defeats its entire purpose and wastes your time and money.

The Correct Window Film Removal and Cleaning Process

Start by carefully peeling the protective film from one corner, pulling slowly and steadily at a low angle to avoid leaving adhesive residue behind. In Ottawa's cold winter months, this step requires extra attention because cold film and adhesive can turn brittle and stubborn, leaving patches of sticky residue on the glass. If you are doing a winter clean, warming the room before attempting film removal can make the process much easier. A heat gun on a low setting can also soften stubborn adhesive, but keep it moving to avoid thermal stress on cold glass.

Once the film is fully removed, inspect every pane for adhesive residue, which appears as a hazy or tacky patch. A glass-safe solvent such as a citrus-based adhesive remover or isopropyl alcohol applied with a soft microfibre cloth will dissolve residue without scratching the surface. Avoid abrasive pads, and do not reach for a razor blade as a first option on adhesive, as fine scratches may not be visible immediately but can become obvious once sunlight hits the surface. After adhesive removal, clean the glass with a glass cleaner and a fresh microfibre cloth or a squeegee, working from top to bottom.

One important caution: do not leave protective film on windows longer than the manufacturer recommends. Summer sun and heat can bake the adhesive onto the glass, making it much harder to remove cleanly. If your new build or renovation extended through winter and into summer, address the film removal promptly once construction wraps up. Quotes for post-construction window cleaning in Ottawa can run roughly $200 to $1,500 depending on the number and accessibility of windows; ask whether film removal is included or priced separately.

For a full post-construction clean that includes all windows, consider browsing cleaning contractors through the Ottawa Construction Network directory at justynrookcontracting.com to find companies that handle the entire process from start to finish.

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