How Often to Clean Windows on a Deux-Montagnes Waterfront Home
A house on the water in Deux-Montagnes usually needs its exterior windows cleaned three or four times a season on the side that faces the lake, compared with twice a year for a typical inland home. The street side can often stay on a spring and fall schedule. The difference is what the lake throws at the glass: insects, wind-blown spray, pollen film and, for many homes, mineral spots from well-water sprinklers.
Below is how to set a schedule that fits a waterfront property, and how to fit it into the short exterior season.
Why lake-facing glass gets dirty faster
Deux-Montagnes sits where the Lac des Deux Montagnes narrows toward the Rivière des Mille Îles, and many homes along Chemin d'Oka, the streets off 8e Avenue and the bays near Grand-Moulin have large windows pointed straight at the water. Those windows are the reason people buy the house. They are also the ones that collect the most.
- Mayflies and midges. In early summer, swarms come off the lake and the river in the evening and land on anything lit or light-coloured. They leave small brown spots and wing residue that bake onto glass in the sun.
- Spiders that follow the insects. Where there are insects, there are webs in the corners of frames, under soffits and around patio doors. Webs hold dust and droppings against the glass.
- Wind and spray. A west or southwest wind across open water carries fine droplets and whatever is floating on the surface in summer. When they dry, they leave a dull, slightly cloudy film on the lake side only.
- Birds. Gulls, geese and ducks are part of the shoreline. Droppings on upper panes and sills are common, and they etch glass if left for weeks in the heat.
- Pollen and seeds. Mature willows, poplars and maples along the shore shed seeds and pollen in late spring that stick to wet glass.
The street side of the same house, facing a quiet residential road, sees far less of this.
A schedule that works for most waterfront homes
Exterior window cleaning in Greater Montréal runs from about March to November, so there are roughly eight months to work with. For a lakefront house, a schedule along these lines covers the problem periods:
- Spring (April or May). Clears winter grime and any road salt film on the street side. This is the full-house visit.
- Early summer (late June or July). Right after the mayfly swarms taper off, before the spots have spent a whole summer in the sun.
- Late summer (August or September). Removes spray film, webs and bird droppings from the high-use season on the deck and dock.
- Fall (October or early November). The last exterior clean before freeze-up, so the glass goes into winter clear and the sills are free of leaves.
Four visits a season is a quarterly program. If that is more than you need, the next step down is spring and fall for the whole house, with the lake side added once in midsummer.
When twice a year is enough
Not every house on the water needs more. Homes set well back behind trees, houses on a channel rather than open water, and homes where the main windows face east or north (away from the prevailing wind) often stay presentable on a spring and fall schedule. If you can look through the lake-facing glass in August without noticing spots, two visits are probably fine.
When you might want more
Houses right on the shoreline with floor-to-ceiling glass, outdoor lighting that draws insects at night, or a sprinkler system on well water tend to need cleaning more often. A bi-monthly program through the season suits those homes better than a quarterly one.
Well water, sprinklers and mineral spots
Some properties near the water irrigate lawns and gardens from a private well. Groundwater in the region can be high in calcium and iron, and when a sprinkler mists the lower windows every morning, the minerals dry on the glass as white or orange spots. Over a few weeks they build into a crust that ordinary cleaning cannot lift.
Altara cleans with pure deionized water on a water-fed pole, which dries without leaving spots of its own. Light mineral spotting usually comes off during a regular visit. Heavy, layered mineral stains are a separate job and are quoted on their own because they take more time and a different method. Angling sprinkler heads away from the house is the cheapest fix.
What a regular visit includes
The flat rate, chosen by window-count tier on the pricing page, covers the exterior:
- exterior glass, frames and sills;
- pure deionized water on a water-fed pole, from the ground;
- screens rinsed in place.
Interior glass, screen removal and washing, and track cleaning are optional paid add-ons. Waterfront homes often have big sliding doors to a deck, and their tracks fill with sand and insect debris over the summer, so the track add-on is worth considering on the fall visit. Skylights and solariums are quoted separately.
The pole reaches up to three storeys from the ground. Many lake houses are built on a slope, with a walkout basement on the water side, which makes the back wall taller than the front. If the lake side is over three storeys from grade, or the only access is from a steep bank or a retaining wall, the crew does a site visit first.
If a screen is torn (common on lake-facing windows after wind storms), the crew points it out so you can have it repaired. Altara does not repair screens.
Costs of a recurring program
Recurring service is where the discounts are. Quarterly service is 10% off the flat rate, bi-monthly is 15% off and monthly is 20% off. The bi-annual and annual programs do not have a discount, but they come with automated reminders so the spring and fall visits do not slip. For a waterfront home on a quarterly schedule, the discount helps offset the extra visits.
Every visit carries the streak-free guarantee: report a streak within 24 hours and the crew returns at no charge. Altara has cleaned windows at more than 7,800 homes across Greater Montréal.
Booking the last exterior visit of 2026
It is late October, and the exterior season ends once nights stay below freezing, since water on the glass can freeze before it dries. Lakefront homes tend to feel the cold first because of the wind off the water. If you want the lake-side glass clean for the winter view, book the fall visit now. If the season closes before your date, interior glass can be cleaned all winter, and the exterior can go first on the spring schedule.
Frequently asked questions
How often should lakefront windows be cleaned in Deux-Montagnes?
Most lakefront homes do well with three or four exterior cleanings between April and November on the water side, and two on the street side. Houses set back from the shore or facing away from the wind can often stay on a spring and fall schedule.
Can mayfly spots be removed from windows?
Yes, fresh spots come off in a normal pure-water clean. The longer they sit in the summer sun, the harder they get, which is why an early summer visit right after the swarms is useful on lake-facing glass.
Why do lower windows get white spots that will not wash off?
The usual cause is a sprinkler or hose running on hard well water, which leaves calcium and iron behind as it dries. Light spotting comes off in a regular visit, while heavy buildup is quoted separately. Redirecting the sprinkler heads stops it from coming back.
Is a walkout basement on the lake side a problem for window cleaning?
Usually not. The water-fed pole reaches three storeys from the ground, which covers most walkout designs. If the wall is taller than that or the ground is too steep to stand on safely, a site visit comes first.
Set up your waterfront schedule
Choose your window-count tier on the pricing page, or send your address and the schedule you have in mind through the contact page. You can also see the area we cover on the Deux-Montagnes service page.