Interior Window Cleaning in Toronto — Why It's Harder Than It Looks
Window cleaning is one of those tasks that most Toronto homeowners attempt regularly and most find frustrating — the result is invariably streaky, often worse than before cleaning, despite seemingly straightforward technique. The reason is that streak-free window cleaning is genuinely technique-sensitive: the wrong tool, wrong solution, wrong order of operations, or wrong environmental conditions (direct sunlight while cleaning, for example) produces streaking regardless of effort. Understanding the actual mechanism of streaking and the professional approach to avoiding it makes interior window cleaning a predictable, achievable task.
Why Windows Streak
Window streaking occurs when cleaning solution residue is not fully removed from the glass before it dries. The residue may be:
- Surfactant residue from the cleaning solution: Most commercial window cleaners contain surfactants that, if not fully removed, leave a thin film that shows as streaks in raking light. Too much product is the most common cause.
- Mineral deposits from hard water: Toronto's water has moderate mineral hardness. Water dried on glass leaves mineral deposits — white haze in dull light, visible streaks in direct light.
- Paper towel lint and fibres: Paper towels, despite widespread use for window cleaning, leave lint and fibres on glass that are visible as fine streaking in direct sunlight.
- Solution drying too fast: In direct sunlight or on very warm days, cleaning solution evaporates before it can be fully removed — leaving residue regardless of technique. This is why window cleaning professionals work in shade and avoid midday sun.
The Streak-Free Method for Toronto Windows
Tools Required
- A rubber-bladed squeegee (10–12 inch for standard windows — the professional standard; avoid foam squeegees)
- A microfibre cloth or window scrubber (for applying solution)
- A second, dry microfibre cloth (for edge detailing)
- Cleaning solution (see below)
Solution Options
- Professional standard — water with a few drops of dish soap (not Windex): 1–2 drops of Dawn (or similar) in a bucket of water. Enough surfactant to cut grease and film, not enough to leave a residue. This is what most professional window cleaners in Toronto actually use.
- Vinegar and water (50/50): Effective for mineral deposits and general film. No surfactant residue risk. Smell dissipates quickly. Does NOT work on natural stone windowsills — vinegar etches stone.
- Commercial glass cleaner (Windex, etc.): Works, but the blue dye and higher surfactant concentration means it's easier to leave residue than plain soapy water. Use sparingly — spray on cloth, not directly on glass.
The Sequence
- Work out of direct sunlight. In Toronto, east-facing windows on morning cleaning days, west-facing in afternoon — time the cleaning to the sun position, or use overcast days.
- Dust the window frame and sill first. Dust that falls onto a wet window surface re-soils it immediately — always dry-dust the frame before wetting the glass.
- Apply solution sparingly. Wet the scrubber or cloth, wring it, then apply to the glass — the glass should be wet but not dripping. Excessive solution = more residue to remove.
- Squeegee from top to bottom in overlapping vertical strokes, wiping the blade on the dry microfibre cloth after each stroke. Overlapping strokes by about 2 cm prevents missed strips.
- Detail the edges with the dry microfibre cloth. Run the cloth along all four edges of the glass to capture any solution the squeegee left at the frame edge.
Toronto Condo Window Cleaning — Special Considerations
Toronto condo windows (particularly high-rise units) collect a film of urban particulate — an oily, grey-beige film from vehicle exhaust and urban dust that is more resistant to simple water-and-soap cleaning than typical house window soil. For heavily soiled condo windows, a light application of rubbing alcohol (70% isopropyl) on a microfibre cloth before the squeegee pass removes this film more effectively than soap-water alone. Exterior high-rise window cleaning requires professional equipment and is typically managed by the condo corporation on a schedule.
Professional Window Cleaning in Toronto
Interior window cleaning is included in Maidless deep cleaning visits for Toronto homes and condos. Book at maidless.ca/ontario. HST 13%, all supplies, 4.9★ rated.