 *Photo: Unsplash*
Clean windows make a surprising difference in how your home looks and feels. Natural light is one of the biggest factors in a space feeling bright, open, and welcoming — and dirty windows block more of it than you'd think.
But in Montreal, keeping windows clean is harder than in most cities. Between road salt spray in winter, cottonwood fluff in late spring, summer humidity condensation cycles, and fall leaf tannins on exterior glass, your windows take a battering all four seasons. This guide covers exactly when and how to clean them — DIY and professional — plus the seasonal home maintenance tasks that belong alongside each window cleaning.
Why Montreal Windows Get So Dirty So Fast
Montreal's climate creates four distinct window-dirtying seasons:
Winter (November–March): City trucks spray calcium chloride and road salt from October through April. Every vehicle that passes kicks up a fine salt mist that settles on lower exterior windows and sills. By February, the salt crust is thick enough to noticeably cut your daylight. Add the condensation cycle — warm interior air hitting cold glass creates daily moisture streaks that collect airborne dust — and interior windows need attention too.
Spring (April–May): Montreal's cottonwood and poplar fluff (fluvet) peaks in May and early June. The sticky white fibres mat onto window screens and frames and work their way into tracks. At the same time, the first rain after winter washes salt and grit off rooflines directly onto upper windows. A thorough post-winter wash is non-negotiable.
Summer (June–August): Lower grime accumulation overall, but exterior windows on humid homes develop a hazy film from evaporated condensation. Balcony grills and BBQ smoke leave residue on glass facing outdoor cooking areas.
Fall (September–October): Maple and linden leaf tannins leave a sticky reddish-brown stain on sills and lower exterior panes. Once dried on, tannin stains require enzyme cleaner or diluted white vinegar treatment — plain water will not lift them.
When to Clean Your Windows: The Montreal Schedule
For most Montreal homes, twice a year is the minimum:
1. Spring clean (May): After cottonwood fluff peaks and before summer humidity builds. Clear all winter salt from frames, sills, and glass. This is the priority clean — the one that makes the biggest visible difference after months of sealed-up windows. 2. Fall clean (September–early October): Before leaf-fall peaks and before temperatures drop below 5°C. Below that threshold most squeegee solutions streak on contact with cold glass.
Situations that warrant a third clean (midsummer July): - Homes on arterial roads with heavy truck or bus traffic - Homes near active construction sites (concrete dust settles on glass within days) - Airbnb units where guest impression of cleanliness matters for reviews
DIY Window Cleaning: What Actually Works
The streak-free method professionals use is simpler than most tutorials suggest.
What you need: - A squeegee (30–45 cm blade) - A microfibre scrubber or lint-free cloth for applying solution - Window cleaning solution: a few drops of dish soap in warm water, OR diluted white vinegar (1 part vinegar : 10 parts water). Avoid commercial spray cleaners on large panes — they evaporate too fast and leave residue. - A second dry microfibre cloth for edges and corners
The technique: 1. Dust frames, sills, and tracks first — loose grit dragged across wet glass creates scratches and streaks 2. Wet the entire pane with solution using the scrubber 3. Draw the squeegee in overlapping horizontal passes from top to bottom 4. Wipe the squeegee blade dry with a cloth after each pass 5. Dry edges and corners with the clean microfibre cloth 6. For interior glass: follow the same sequence, then buff lightly with a dry cloth
Common mistakes that cause streaks: - Cleaning in direct sunlight — solution evaporates before you can squeegee it off - Using paper towel instead of microfibre — it leaves lint on the glass - Forgetting to clean tracks — dirty tracks re-contaminate clean glass every time the window opens - Skipping the dust-first step — grit on a wet pane scratches the surface and drags streaks
Interior vs. Exterior Window Cleaning
Interior cleaning is accessible to most homeowners and should be done at both the spring and fall clean. It covers: both surfaces of interior panes, window frames and sills, tracks and channels, and interior-facing screens.
Exterior cleaning is where most Montrealers call professionals. Reasons: - Upper-floor windows require ladders or extension equipment - Montreal exterior window ledges accumulate pigeon debris, heavy salt crust, and construction film that often require stronger degreasers than household products - Many condo and apartment buildings restrict exterior window work by residents - Post-winter salt crust on aluminum frames sometimes needs a pre-soak before it will release without scratching
For bungalows with accessible ground-floor windows, exterior DIY is feasible with a garden hose and extension squeegee. For anything above the ground floor, professional service is safer and faster.
Professional Window Cleaning in Montreal: What's Included
A standard professional window clean covers: - Interior and exterior glass cleaned streak-free - Frame and sill wipe-down - Track cleaning and lubrication - Screen removal, rinse, and reinstall - Removal of salt crust, tannin stains, and construction film with appropriate solutions
Specialty add-ons available from professional services: - Hard water mineral deposit removal (common on bathroom glass and shower enclosures) - Post-construction window cleaning (drywall compound and paint overspray) - High-rise exterior access using extension poles or professional rope access
2026 Window Cleaning Pricing in Montreal
Prices vary by home size, number of panes, floor count, and current grime level:
| Home Type | Interior Only | Interior + Exterior | Notes | |---|---|---|---| | Condo / 1½–2½ apartment | $80–$140 | $140–$220 | Ground to 3rd floor | | 3½–4½ apartment | $100–$160 | $180–$260 | — | | Bungalow (1 storey) | $120–$180 | $200–$280 | Depends on window count | | Semi-detached / duplex | $150–$220 | $260–$360 | Includes both floors | | Detached home (2 storey) | $180–$280 | $320–$480 | Ladder work adds cost | | Large estate / 3-storey | $300–$500+ | $500–$900+ | Rope access may apply |
These ranges reflect the Montreal market in 2026. Salt crust removal on frames, screen cleaning, and hard-water mineral treatment may be quoted as add-ons.
Booking tip: Spring appointments (May) fill up quickly — book in April, or combine window cleaning with a [spring deep clean](/en/services/deep-cleaning) to secure a date and reduce the total visit cost.
The Seasonal Home Maintenance Calendar
Window cleaning fits into a broader rhythm of seasonal maintenance. Here's what should happen alongside each window clean:
Spring (May) — The Big Reset
- Wash windows inside and out (priority)
- Deep clean the kitchen (inside appliances, refrigerator coils and drip tray, under the range hood filter)
- Clean or replace HVAC and forced-air furnace filters — essential after five months of salt-dust circulation
- Dust ceiling fans, baseboard heaters, and light fixtures
- Clean dryer vent — lint accumulation in the vent hose is a fire risk
- Check weather stripping on windows and exterior doors — winter ice expansion can degrade seals
- Wash and store heavy winter blankets (vacuum bags keep them clean until fall)
Summer (July–August) — Light Maintenance
- Clean balcony and terrace furniture and surfaces
- Wipe window tracks — pollen and cottonwood accumulate through open screens during summer
- Clean refrigerator drip tray — warm weather accelerates bacterial growth
- Organize storage areas (closets, garage, shed)
Fall (September–October) — Winter Preparation
- Wash windows before temperatures drop below 5°C (exterior streak threshold)
- Replace HVAC filters before heating season starts
- Check and clean weather stripping on doors and windows
- Deep clean before the holidays — guests + holiday cooking = faster surface buildup
- Have furnace or boiler serviced — book in September since October is fully booked across Montreal
Winter (December–March) — Indoor Air Quality Focus
- Change HVAC filters monthly (winter salt dust + dry indoor air circulates particles faster than any other season)
- Deep clean kitchen and bathrooms
- Wipe window sills every 2–3 weeks — salt mist from door entries accumulates on interior sills even in sealed-window season
- Clean and declutter after the holidays
For more on deep seasonal cleaning, see our [spring cleaning checklist for Montreal](/en/blog/spring-cleaning-montreal-2026-checklist-and-pricing), our guide on [how to prepare for a cleaning service visit](/en/blog/how-to-prepare-for-a-cleaning-service-visit), and our [post-renovation cleaning checklist](/en/blog/post-renovation-cleaning-checklist-montreal) for homes coming out of winter renovation work. Our [window cleaning service page](/en/services/window-cleaning) has booking details; window cleaning can also be combined with [home cleaning](/en/services/home-cleaning) or a [recurring cleaning service](/en/services/recurring-cleaning) for ongoing maintenance.
FAQ
Q: How often should I clean my windows in Montreal? Twice a year at minimum: spring (May) to clear winter salt, condensation buildup, and cottonwood residue, and fall (September–early October) before cold weather seals windows for the season. Homes on busy arterial roads or near active construction may benefit from a third clean in July.
Q: Can I clean my windows in winter in Montreal? Interior windows can be cleaned year-round. Exterior window cleaning should only be done when temperatures are above 5°C — below that threshold, squeegee solutions freeze on contact with cold glass and streak badly. Most Montrealers schedule exterior cleaning in May and September for this reason.
Q: What removes road salt stains from window frames and sills? A solution of warm water with a small amount of dish soap removes most salt crust. For heavy winter buildup, a pre-soak with diluted white vinegar (1 part vinegar : 10 parts water) for 5–10 minutes loosens the mineral deposits before wiping. Rinse thoroughly afterward — vinegar left on aluminum frames can cause oxidation over time.
Q: How much does professional window cleaning cost in Montreal? For a typical 3½–4½ apartment, expect $100–$160 for interior only and $180–$260 for interior and exterior in 2026. Larger detached homes (2 storey) run $320–$480 for interior and exterior. Salt crust removal and screen cleaning may be priced as add-ons.
Q: What's the best window cleaning solution — vinegar or dish soap? Both work well for different situations. Diluted white vinegar (1:10 with water) excels at cutting mineral deposits and salt haze. Dish soap in warm water is better for greasy residue — common near kitchen windows or on streets with heavy diesel traffic. For streak-free results on large panes, use either with a squeegee rather than spray-and-wipe products.
Q: Do professional window cleaners clean screens? Yes — screen cleaning is typically included or available as an add-on with professional window services. Montreal screens accumulate cottonwood fluff, pollen, and salt particulate throughout the year, which restricts airflow and re-contaminates cleaned glass every time the window is opened. Screens are usually removed, rinsed, and reinstalled.
Q: Should windows be cleaned before or after a deep clean of the home? Windows should be cleaned after a deep clean, not before. Vacuuming, scrubbing floors, and cleaning surfaces kicks up airborne dust that resettles on glass within an hour. Having windows done last — or as a separate booking after the main clean — keeps them streak-free for longer.
