The honest answer — by season, home type, and neighbourhood. No sales pitch, just what actually makes sense for your home.
Twice a year for most Toronto homes. Once in spring (April-May) and once in fall (September-October). If you only clean once, make it spring — that's when windows need it most.
But the real answer depends on where you live, what's around your home, and how much natural light matters to you. Here's the breakdown.
| Situation | How Often | Why |
|---|---|---|
| Standard home, residential street | 2x/year (spring + fall) | Winter grime in spring, pollen and dust in fall |
| Near a busy road (Kingston Rd, Lawrence, Eglinton) | 3-4x/year | Road spray, exhaust film, salt splash zone |
| Near construction | Every 2-3 months | Concrete dust, drywall dust coats glass fast |
| Heavily treed lot (ravine, mature canopy) | 2-3x/year | Tree sap, pollen, insect residue, bird droppings |
| Lakefront / near the Bluffs | 3x/year | Mineral-heavy mist, wind-driven grit |
| Condo (ground floor with street exposure) | 2-3x/year | Splash zone from rain + road, pedestrian dust |
| Home with large south-facing windows | 2x/year minimum | UV + heat bake mineral deposits into glass faster |
| Home seller (pre-listing) | 1x (immediately) | Clean windows increase perceived home value by $5K-10K |
This is when the damage happens. Road salt spray reaches windows 15-20 feet from the road. Calcium chloride leaves white mineral deposits that etch into glass over time. Freeze-thaw cycles push moisture into window seals, accelerating seal failure. And you can't clean during winter — too cold for water to work properly.
Result: By April, every window in Toronto has 4-5 months of accumulated grime. This is why spring cleaning makes the biggest visual impact.
Prime cleaning season. All winter damage is visible, temperatures are ideal for cleaning, and you get to enjoy clean windows through the entire summer. This is when most homeowners book — and when most companies fill up fastest.
Book early. Most window cleaning companies in the GTA are fully booked by mid-April. If you wait until May, you might not get in until June.
Pollen season (May-June) coats windows in yellow film. Tree sap drips onto anything under branches. Insect residue (especially on south and west-facing windows) builds up. Summer storms leave mineral-rich water spots that bake in the sun.
If your windows look good after spring cleaning, you can skip summer. But if you're near trees or in a high-pollen area, a mid-summer touch-up keeps things sharp.
Leaf tannins stain lower windows. Dust from dry September weather coats everything. Cleaning in October before you seal up for winter means you start the cold months with clear glass and better natural light through the darker season.
Nothing dramatic in the first year. But over time:
Exterior is more important for glass health. That's where the salt, mineral deposits, and environmental damage happen. Exterior-only cleaning is perfectly fine for most homes as an annual minimum.
Interior is more important for how your home feels. You look through windows from the inside. Interior grime — cooking grease film, dust, fingerprints, pet nose prints — is what you actually notice day to day. Interior + exterior together makes the biggest difference in how your home looks and feels.
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