How to Clean Montreal Windows Before the Grey Season Hits

Why September Is the Right Time for This

Montreal window-washing has a narrow seasonal window (no pun intended). By mid-October, temperatures drop enough that most cleaning solutions streak or dry unevenly, and the grey overcast that settles over the city until April makes dirty glass feel oppressive in a way it just doesn't in summer. Clean your windows now — while the weather is still cooperative — and you'll genuinely notice the difference every morning from now until spring.

What You Actually Need

Skip the blue spray. It leaves a film, especially on older glass, and that film shows up badly in fall's low-angle light. Instead, use this:

• Two buckets — one for your cleaning solution, one with clean rinse water
• A few drops of dish soap in warm water — genuinely that's enough
• A squeegee with a fresh rubber blade — rubber goes hard with age and starts to skip
• A lint-free microfibre cloth for edges and frames
• A dry chamois or second clean microfibre for any remaining streaks

If you have older Montréal duplex or triplex windows with aluminium frames, wipe the frames down first — they accumulate a grimy oxidation residue all summer that will just spread onto your glass if you don't deal with it separately.

Do the Outside First, Then the Inside

This matters more than most people realize. If you clean inside first, you won't be able to tell which side a remaining streak is on when you step back to check. Outside first means you can identify and fix inside streaks cleanly at the end.

For outside panes you can reach safely, wet the glass fully, then pull the squeegee in overlapping horizontal strokes from top to bottom. Wipe the blade on a cloth after every stroke — this is what separates a streak-free result from a smeary one. For second-floor windows on a classic Montréal semi-detached, don't improvise. A proper extension pole for a squeegee is inexpensive and far safer than an overreached ladder on uneven ground.

Pay Attention to the Tracks and Sills

The tracks on sliding and tilt-turn windows collect a particular mix of summer debris: insect remains, cottonwood fluff, condensation residue, and grit blown in off the street. A dry paintbrush or a vacuum crevice attachment loosens all of it before you introduce any moisture — once you wet compacted track debris, it turns into a paste that's much harder to remove. After vacuuming, wipe the track with a damp cloth, let it dry, and then add the thinnest possible smear of silicone lubricant if the window slides. This keeps things moving smoothly all winter.

Outside sills — especially on anything near Rue Sherbrooke, boulevard Saint-Laurent, or other high-traffic corridors — will have a thin layer of urban grime and soot that looks clean until you run a white cloth across it. Wipe them down with a mild all-purpose cleaner before washing the glass, otherwise you'll be dragging that residue across your clean panes with the squeegee.

When to Call It and Let Someone Else Do It

A few situations where the DIY approach genuinely isn't worth it:

• Third-floor or higher exterior glass on a Montréal walk-up or condo — not a reasonable solo job without proper equipment
• Large fixed-pane windows, common in newer Plateau and Rosemont constructions — they're harder to squeegee neatly without experience
• Windows with interior cellular blinds or fabric shades mounted close to the glass — cleaning around them without disturbing or wetting them takes extra time and care

One Final Check Before You're Done

Stand outside the house in the late afternoon, when the sun is lower in the sky and hitting the glass at an angle. This is exactly the light you'll be living with for the next six months, and it's also exactly the light that exposes every streak you missed. A pane that looked fine at noon will show every smear at 4 p.m. in October. Check now while you still have warm water and a dry cloth in hand.

It's a small task that most people put off until it's too cold to do properly. Getting it done in September means you've bought yourself a full season of decent natural light — and in Montréal, you take every bit of that you can get.