 *Photo: Unsplash*
Window treatments do a quiet job: blocking early summer light, softening street noise, and keeping January drafts at bay. But in a Montreal apartment — with its cottonwood-loaded springs, salt-heavy winters, and 70–75% summer humidity — curtains and blinds accumulate allergens, calcium film, and even condensation mold at a pace most cleaning guides ignore.
This guide covers every window treatment type you'll find in Montreal housing, from the sheer panels in a Plateau triplex to the aluminum Venetian blinds in a Côte-des-Neiges 1980s rental to the blackout rollers in a Griffintown condo — and gives you the exact cleaning protocol for each.
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Why Montreal Window Treatments Need More Attention
1. Cottonwood season (May–June) Montreal's iconic poplars release clouds of white cotton fluff for six weeks each spring. The fluff enters through open windows, clings to curtain fabric, collects in blind slat grooves, and packs into the accordion folds of Roman shades. If you have allergies, this is the single biggest trigger season for window treatments.
2. Ragweed season (August–September) Quebec has some of the highest ragweed pollen counts in Canada. Curtains left open at night collect pollen on their interior surface. Weekly vacuuming during ragweed season (late August to first frost) dramatically reduces indoor allergen load.
3. Montreal hard water (90–150 mg/L) St. Lawrence watershed water carries 90–150 mg/L of dissolved calcium and magnesium. Machine-washing curtains with untreated tap water — especially in a rinse-only cycle — deposits a white calcium film on fabric that makes clean curtains look dull. A white vinegar rinse cycle dissolves this mineral residue.
4. Winter condensation mold When exterior temperatures drop to −25°C to −30°C (January–February), the interior surface of window glass chills dramatically. Heavy lined curtains or blackout panels that touch the cold glass develop condensation between the curtain and the window. Within 8–12 weeks, this creates mold along the bottom 10–15 cm of curtain fabric. This is a common, poorly understood problem in Montreal apartments.
5. July 1 and September 1 move-in An estimated 65–70% of Montreal leases turn over on July 1. Apartments frequently come with previous tenants' curtains (especially if listed as furnished or if the previous tenant simply left them). These curtains may have years of dust, smoke residue, or mold — photograph their condition before washing.
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Know Your Window Treatment Type
Before cleaning anything, identify what you have. The wrong method can permanently damage curtains or blinds.
Curtains and Drapes
| Type | Description | Where found in Montreal | |---|---|---| | Sheer panels | Lightweight translucent fabric (voile, batiste, polyester) | Most apartments — lets in light while providing privacy | | Lined curtains | Opaque outer fabric + white/blackout liner | Family homes, bedrooms wanting darkness or heat insulation | | Velvet or brocade | Heavy decorative fabric, often inherited | Pre-war triplex heritage décor; older furnished apartments | | Blackout curtains | 3-pass blackout fabric with separate liner layer | New condo bedrooms — Griffintown, Square-Victoria, Plateau | | Thermal/insulating | Thick layered panels for energy efficiency | West Island bungalows, suburban homes with large windows |
Blinds and Shades
| Type | Description | Where found in Montreal | |---|---|---| | Aluminum Venetian | Horizontal aluminum slats, tilting mechanism | 1970s–1990s rental buildings everywhere in Montreal | | PVC Venetian | Wider horizontal plastic slats | Office-conversion condos, commercial spaces | | Wood/faux-wood | Solid or composite wood horizontal slats | Westmount, Outremont, TMR homes with hardwood interiors | | Vertical blinds | Vertical fabric or PVC slats | 1970s–1990s Côte-des-Neiges, LaSalle, Pierrefonds rentals | | Roller/blackout | Single fabric sheet on a rolling mechanism | New condo bedrooms, Airbnb short-term rental units | | Roman/cellular | Pleated fabric that stacks when raised | Premium apartments, Outremont/Westmount heritage-decorated interiors |
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What You'll Need
General supplies: - Vacuum cleaner with upholstery/brush attachment - Microfibre cloths (dry and damp) — Canadian Tire, Dollarama ($3–12) - Gentle detergent: Woolite at Jean Coutu/IGA/Pharmaprix ($8–12), or Seventh Generation at Loblaws/IGA ($10–14) - White vinegar — IGA, Maxi, Metro, Dollarama ($2–4) - Mesh laundry bag (large, for delicate curtains) — Jean Coutu, Canadian Tire, Dollarama ($5–10) - Bucket or bathtub
For blinds: - Microfibre duster or flat duster wand — Canadian Tire, Dollarama ($3–8) - Old cotton socks (for slat-by-slat cleaning) — free reuse - Murphy Oil Soap (for real wood blinds only) — Canadian Tire, Rona ($8–12) - Rubbing alcohol (for PVC disinfection) — Jean Coutu/Pharmaprix ($4–7)
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How to Clean Curtains by Type
Sheer Panels (Most Common in Montreal Apartments)
Sheer panels are delicate. Machine washing on the wrong cycle causes snags, pulls, and permanent creasing.
Step 1 — Remove hooks and rings. Take down the panel, remove curtain rings, clips, or grommets. Never machine-wash with metal hardware attached.
Step 2 — Shake outside. Take to a balcony or exterior staircase. Shake vigorously in the direction of the weave to dislodge cottonwood fluff, dust, and pollen. This prevents these particles from embedding deeper during washing.
Step 3 — Delicate cycle with cold water. Use a mesh laundry bag (triplex agitator machines can snag sheer fabric). Gentle/delicate cycle, cold water, 1 tbsp Woolite or other delicate detergent. Do NOT use hot water — it permanently sets creases in polyester sheers.
Step 4 — White vinegar rinse. Add ½ cup white vinegar to the fabric softener dispenser. The vinegar neutralizes hard water calcium deposits and acts as a natural fabric softener — sheers come out brighter without a milky calcium film.
Step 5 — Drip dry immediately. Rehang while damp on the rod. The weight of the wet fabric pulls wrinkles out naturally. Never machine-dry sheers — heat causes polyester to shrink and wrinkle permanently.
Frequency: Monthly during cottonwood/ragweed season (May–June, Aug–Sept); every 2–3 months otherwise.
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Lined and Thermal Curtains
Lined curtains can be machine-washed, but the liner layer often has a different shrink rate than the outer fabric. Washing at the wrong temperature causes the liner to "bubble."
1. Check the care label. If it says dry clean only, bring to a dry cleaner — do not risk it. 2. If machine-washable: remove hardware, wash in a mesh bag on delicate, cold water. 3. Wash the outer fabric and liner together so both shrink at the same rate. 4. White vinegar rinse (½ cup in fabric softener dispenser). 5. Remove while damp, reshape, rehang immediately to prevent creasing.
Montreal condensation mold note: Lined curtains touching a cold winter window will develop condensation mold on the liner's back face (January–February). Check monthly. Surface mold: spot-treat with undiluted white vinegar, let sit 15 minutes, blot clean. If mold has penetrated to the outer fabric layer: replace the curtain.
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Velvet, Brocade, or Heavily Embroidered Curtains
Common in pre-war triplexes with older décor, or inherited at July 1. These cannot be machine-washed.
1. Vacuum with upholstery attachment on low suction. Move in one direction only — with the pile for velvet. 2. Spot clean stains with a damp microfibre cloth and a drop of Woolite. Blot — never rub. 3. Steam from a handheld steamer held 5 cm away refreshes the fabric. Do NOT touch the steamer head to velvet. 4. Professional dry cleaning for any deeper stains or annual deep refresh ($30–80 per panel at a Montreal dry cleaner).
TAL note: If you inherited velvet curtains from a previous tenant at July 1, photograph their condition at move-in. If they were installed by the landlord, cleaning is your responsibility; if left by the previous tenant as personal property, they are not your obligation — but document the condition regardless.
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Blackout and Thermal Roller Curtains
Blackout panels in new condos typically have a woven outer layer and a blackout-coated backing. Do NOT submerge the blackout coating in water — it can delaminate.
1. Vacuum the woven outer side regularly with a soft brush attachment. 2. Spot-clean marks on the outer face with a damp microfibre cloth. 3. If machine-washable (check care label): cold delicate cycle, mesh bag, no heat dry. Many blackout curtains are NOT machine-washable — when in doubt, hand-wash or dry clean.
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How to Clean Blinds by Type
Aluminum Venetian Blinds (Most Common in Montreal Rentals)
Standard aluminum Venetian blinds in 1970s–1990s rental buildings accumulate layers of cooking grease + dust.
Method A — In-place cleaning (routine): 1. Close slats to one side (fully tilted). 2. Wipe top-to-bottom with an old cotton sock or flat microfibre duster dampened with all-purpose cleaner. 3. Flip slats to opposite angle. Repeat. 4. Open slats, wipe cords.
Method B — Bathtub soak (deep clean, 2× per year): 1. Take down the blind. Lay in bathtub filled with warm soapy water (1 tsp dish soap). 2. Soak 10–15 minutes. Use a soft sponge to wipe each slat individually. 3. Rinse thoroughly. Hard water note: Final rinse with ½ cup white vinegar in the bath water prevents calcium film on aluminum slats. 4. Hang over the shower rod or balcony railing to dry completely before rehanging. Never rehang while wet — moisture trapped in the mechanism causes corrosion and the tilt rod jams.
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PVC/Plastic Venetian Blinds
Same method as aluminum, but PVC tolerates slightly warmer water. For disinfection (kitchen, bathrooms), add 1 tbsp rubbing alcohol to the rinse water.
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Wood and Faux-Wood Blinds (Westmount / Outremont / TMR)
Real wood slats must never be submerged in water — swelling warps the wood and splits the finish permanently.
1. Dust weekly with a dry microfibre cloth or flat duster. 2. Spot clean marks with a cloth barely dampened with Murphy Oil Soap solution (a few drops in water). Wring out completely — the cloth should feel almost dry. 3. Wipe dry immediately with a second dry cloth. 4. Never soak, spray, or steam-clean wood blinds.
Faux-wood (composite PVC) blinds can tolerate damp wiping but not soaking.
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Vertical Blinds — Fabric Slats (1970s–1990s Rentals)
1. Remove individual slats by unhooking from the carrier clips. 2. Machine-wash on delicate, cold, in a mesh bag. Do not mix multiple slat colours — dyes can bleed. 3. Rehang while damp — they air-dry flat and crease-free. 4. PVC vertical slats: wipe with damp cloth. Do not machine-wash.
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Roller Blinds and Blackout Shades
1. Dust with a flat duster while extended. 2. Spot-clean marks with a damp microfibre cloth — no soaking. 3. Let dry completely before rolling up to prevent mold in the rolled-up fabric.
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Frequency and Maintenance Table
| Treatment type | Dust/vacuum | Wash/deep clean | Notes | |---|---|---|---| | Sheer curtains | Every 2–4 weeks (cottonwood season: weekly) | Every 1–3 months | White vinegar rinse always | | Lined/thermal curtains | Monthly | Every 3–6 months | Check liner back for condensation mold monthly Jan–Feb | | Velvet/brocade | Monthly (velvet direction only) | Professional dry clean annually | Spot-clean stains immediately | | Blackout curtains | Monthly | As needed — spot only for most | Avoid soaking blackout coating | | Aluminum Venetian | Bi-weekly | Bathtub soak 2× per year | White vinegar final rinse to prevent calcium film | | Wood blinds | Weekly (dry only) | Murphy Oil Soap spot clean quarterly | Never water-soak | | Vertical blinds (fabric) | Monthly | Machine-wash delicate bi-annually | Remove slats individually | | Roller blinds | Monthly | Damp wipe only | Fully dry before rolling up |
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Montreal Seasonal Protocol
| Season | Priority action | |---|---| | May–June (cottonwood) | Shake curtains outside + vacuum weekly; clear blind slat grooves of fluff; wash sheers before peak | | July–August (humidity peak) | Check lined curtains for mold on back face; ensure roller blinds dry fully before rolling | | August–September (ragweed) | Weekly curtain vacuum on interior face; wash pillow covers and curtains that absorb nighttime pollen | | October–April (winter seal) | Monthly check for condensation mold at curtain hemlines; wipe window sill below curtain monthly |
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TAL Move-Out: Curtains and Blinds
Under the Quebec Civil Code and TAL lease interpretation:
- Landlord-installed blinds and curtains (listed in the lease or left as fixtures): you are responsible for cleaning but not replacing normal wear and tear.
- Previous tenant's curtains left behind: they are personal property. Photograph their condition at move-in — this protects you from damage claims at move-out.
- Replacement value: A landlord cannot deduct for blinds already 10+ years old at your move-in — depreciation applies. TAL adjudicators apply a standard useful-life test.
- Condensation mold caused by the apartment's inadequate ventilation or heating is a landlord structural responsibility under Article 1910 of the Civil Code — not a tenant cleaning obligation.
Move-out protocol: Clean all installed blinds (aluminum/PVC/wood) with the appropriate method above. Machine-wash any fabric curtains that came with the apartment. Document with photos before and after.
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When to Call a Professional
Consider professional curtain cleaning when: - Velvet, silk, or brocade panels (specialty fabric — risk of permanent damage if DIY) - Curtains over 3 metres in length (hard to handle in a standard apartment bathroom/laundry) - Extensive mold contamination (mold that has penetrated multiple fabric layers) - Sheers yellowed from nicotine residue (requires commercial solvents) - Roman blinds with delicate pleated construction
[Deep cleaning services in Montreal](/en/services/deep-cleaning) can include window treatment care as part of a full-apartment deep clean. Our [home cleaning service](/en/services/home-cleaning) covers regular maintenance and our [move-in/move-out cleaning](/en/services/move-in-out-cleaning) addresses inherited window treatments at move-in. [Contact us](/en/contact) for a custom quote.
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Frequently Asked Questions
Q: How often should I wash curtains in a Montreal apartment?
A: Sheer panels: every 1–3 months, or monthly during cottonwood (May–June) and ragweed (August–September) season. Lined curtains: every 3–6 months. Velvet or heavy curtains: professional dry cleaning once per year with monthly vacuuming in between. The key Montreal modifier is allergen season — if you or anyone in the apartment has allergies, wash during peak cottonwood and ragweed weeks rather than on a fixed interval.
Q: Can I wash curtains in my triplex's shared laundry machine?
A: Yes, with precautions. Many triplex shared laundry rooms have older agitator top-loaders. For delicate sheers or lined curtains, use a large mesh laundry bag to prevent snags on the agitator post. Use the delicate cycle with cold water and Woolite (available at Jean Coutu/IGA). Add ½ cup white vinegar to the fabric softener dispenser as a final rinse to counteract Montreal's hard water (90–150 mg/L) which leaves a calcium film on fabric.
Q: How do I remove cottonwood fluff from curtains without washing them?
A: Take the curtain outside and shake vigorously in the direction of the weave. Then vacuum with an upholstery attachment using low suction, moving from top to bottom in one direction. A lint roller works well on smaller sheer panels. For blinds, a flat microfibre duster captures cottonwood fluff in the grooves between slats without pushing it deeper.
Q: My curtains have mold along the bottom edge — what should I do?
A: This is a classic Montreal winter problem caused by the curtain touching cold window glass. First: improve air circulation so the curtain does not rest directly against the glass (a curtain rod spacer or holdback keeps the fabric 5–10 cm from the pane). For surface mold on washable fabric: spot-treat with undiluted white vinegar, let sit 15 minutes, blot clean, then machine-wash. If the mold is black and has penetrated through the full fabric thickness, replace the affected panels. If the condensation is caused by the apartment's heating or ventilation system, the landlord has an obligation under Article 1910 of the Civil Code to address the structural cause.
Q: Can I clean wood blinds with water?
A: No — never soak or spray water directly onto real wood blind slats. Water swells the wood grain, warps the slats, and splits the finish permanently. Dust weekly with a dry microfibre cloth. For stubborn marks, use a cloth barely dampened with Murphy Oil Soap solution (a few drops in water), wring it out until almost dry, wipe the mark, then immediately wipe with a second dry cloth. Faux-wood (composite/PVC) blinds can tolerate damp wiping but not submersion.
Q: My previous tenant left curtains behind — what are my obligations?
A: Curtains left by a previous tenant are legally their personal property — you have no obligation to clean and return them. However, photograph their condition at move-in. If the landlord later claims you damaged curtains that were already there in poor condition, your dated move-in photos are your protection under the TAL process. If the curtains were provided by the landlord as fixtures (listed in the lease), you are responsible for cleaning them (not replacing, unless you caused damage beyond normal wear).
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Related Guides
- [How to Clean Pillows in a Montreal Apartment](/en/blog/how-to-clean-pillows-montreal)
- [How to Clean a Mattress in a Montreal Apartment](/en/blog/how-to-clean-a-mattress-montreal)
- [How to Clean a Sofa or Couch in a Montreal Apartment](/en/blog/how-to-clean-a-sofa-couch-montreal)
- [How to Clean Carpet and Rugs in a Montreal Apartment](/en/blog/how-to-clean-carpet-montreal)
- [Move-Out Cleaning Checklist for Montreal Apartments](/en/blog/move-out-cleaning-checklist-montreal)
- [Eco-Friendly Cleaning in Montreal — Products and Methods](/en/blog/eco-friendly-cleaning-montreal)
- [Deep Cleaning Service Montreal](/en/services/deep-cleaning)
- [Home Cleaning Service Montreal](/en/services/home-cleaning)
- [Move-In/Move-Out Cleaning Montreal](/en/services/move-in-out-cleaning)
