How Often Should You Clean Your Windows in Ontario? (2026 Guide)

Ontario's climate is tough on windows. From the salt-laden air of winter to the pollen-heavy spring, the humid summer, and the leaf-staining fall — your windows face a year-round assault from the elements. So how often should you actually have them professionally cleaned? The answer depends on several factors, and this guide will walk you through all of them.

The Short Answer: Twice a Year for Most Ontario Homes

For the majority of homeowners in Hamilton, Dundas, Burlington, Oakville, and surrounding communities, professional window cleaning twice a year is the sweet spot. The ideal times are:

• Spring (April–May): After winter's road salt, sand, and grime have settled on your windows. This is when most homeowners notice the greatest difference.
• Fall (September–October): Before the cold sets in, to remove summer's pollen, insect residue, and dust, and to prepare your windows for the darker months ahead.

Factors That May Require More Frequent Cleaning

While twice a year works for most homes, certain factors may mean your windows need attention more often:

• Proximity to busy roads: Homes near high-traffic roads accumulate exhaust residue and road dust much faster. Quarterly cleaning is often recommended.
• Mature trees nearby: Trees deposit pollen, sap, bird droppings, and leaf stains on windows throughout the growing season. If you have large trees near your home, consider quarterly cleaning.
• Young children or pets: Little hands and curious noses leave marks on interior glass constantly. Many families with young children opt for quarterly interior cleaning.
• Hard water areas: Parts of the Hamilton-Wentworth region have hard water. If you have sprinklers that hit your windows, mineral deposits can etch the glass over time. More frequent cleaning prevents permanent damage.
• Commercial properties: Businesses should consider monthly or bi-monthly window cleaning to maintain a professional appearance for clients and customers.

The Hidden Cost of Neglecting Your Windows

Beyond aesthetics, there are real financial reasons to keep your windows clean. Mineral deposits, hard water stains, and oxidation from acid rain can permanently etch glass over time, requiring expensive window replacement rather than simple cleaning. The cost of a professional window cleaning twice a year is a fraction of the cost of replacing even a single window.

Additionally, dirty windows can block up to 40% of natural light entering your home. That means higher electricity bills for lighting, and a darker, less pleasant living environment.

Interior vs. Exterior: Do You Need Both?

Most professional window cleaning services, including BTG Exteriors, offer both interior and exterior cleaning as a standard service. While exterior windows get dirtier faster (they're exposed to the elements), interior windows accumulate dust, fingerprints, and cooking residue over time. For the best results and maximum natural light, we recommend cleaning both inside and out at least once a year, with exterior-only cleaning for the second annual clean.

Signs Your Windows Need Cleaning Now

• Visible streaks, smears, or water spots
• Reduced natural light in your home
• Visible dust or grime on window frames and sills
• Bird droppings or insect residue on the glass
• Condensation or fogging between double-pane windows (this indicates a seal failure — cleaning won't fix this)

The BTG Exteriors Recommendation

Based on our experience cleaning hundreds of homes throughout Dundas, Hamilton, Burlington, and Oakville, here's our practical recommendation:

• Standard homes: Full clean (inside and out) in spring; exterior-only clean in fall
• Homes near busy roads or with many trees: Quarterly exterior cleaning
• Homes with young children or pets: Quarterly interior cleaning
• Commercial properties: Monthly or bi-monthly, depending on your business type

The best way to determine the right frequency for your home is to have a professional assessment. Contact BTG Exteriors for a free, no-obligation quote and personalized recommendation for your property.

Related Services from BTG Exteriors

If you're thinking about scheduling professional window cleaning, you may also want to consider combining it with one of our other exterior cleaning services for a complete home refresh:

• Residential Window Cleaning — Interior and exterior cleaning for homes of all sizes throughout Hamilton and Dundas.
• Commercial Window Cleaning — Flexible scheduling for offices, retail stores, and multi-unit buildings.
• House Washing — Soft wash exterior cleaning that pairs perfectly with window cleaning for a complete exterior refresh.
• Eavestrough & Fascia Cleaning — Remove black streaks and algae from the exterior of your eavestroughs.

Frequently Asked Questions

How often should windows be cleaned in Hamilton, Ontario?

For most Hamilton homeowners, professional window cleaning twice a year — spring and fall — is the recommended frequency. Homes near busy roads, with mature trees, or with young children may benefit from quarterly cleaning.

Is it worth getting windows professionally cleaned?

Yes. Professional window cleaning delivers streak-free results that are impossible to achieve with household products. It also prevents mineral deposits and hard water stains from permanently etching your glass, which can require expensive window replacement.

What is the best time of year to get windows cleaned in Ontario?

Spring (April–May) is the most popular time, as it removes the winter's accumulation of road salt, sand, and grime. Fall (September–October) is the second most popular, preparing your home for the darker winter months.

Does BTG Exteriors clean windows in Dundas and Hamilton?

Yes. BTG Exteriors provides professional residential and commercial window cleaning throughout Dundas, Hamilton, Burlington, Oakville, Stoney Creek, Grimsby, and Ancaster. Contact us for a free quote.