Interior window cleaning is different from exterior in ways that matter for technique and results. Interior glass collects different types of soil — condensation residue, cooking vapour, fingerprints, and fine household dust — and the work happens in a controlled environment where drips and mess affect furnishings and floors. Here is how professionals approach interior window cleaning.
Preparation Is Everything
Before applying any cleaning solution to interior windows, move everything off windowsills and away from windows. Spread an absorbent cloth or old towel on the floor beneath each window to catch drips. Remove window coverings (blinds, curtains, valances) if possible — or tie them back so they're completely clear of the glass. Using a dry brush or vacuum with a brush attachment, clean the window tracks and sills of loose debris before any wet work begins.
The Right Technique
Work top-to-bottom on every window. Apply your cleaning solution to the glass with a damp microfibre scrubber or cloth, working it across the entire surface. Use a squeegee starting from the top, overlapping each pass by about an inch, and wiping the squeegee rubber with a clean cloth between each stroke. For small panes (like divided light windows with individual glass sections), use a small squeegee or a folded microfibre cloth in a stroking motion rather than a squeegee pass.
Tricky Problem Areas
Corners are the hardest part of interior window cleaning. Squeegees don't reach corners, so you need a pointed detail cloth or cotton swab to pick up the residue the squeegee leaves at the edges. Sliding door glass is one of the most challenging interior surfaces — the glass is large, often has a roller track at the bottom that splashes dirty water, and is frequently touched. Give sliding doors extra attention, especially the low section that pets and children contact most.
Pro Tip: Use a dry squeegee (without any cleaning solution) to quickly check your work. Run it across the clean glass — any remaining residue shows up as a haze on the rubber. If it comes up clean, you're done. If not, detail that spot with a damp cloth.
Products That Work Inside
Use very dilute cleaning solution for interior windows — two or three drops of dish soap per litre is sufficient. More soap means more residue to rinse. For touch marks and fingerprints, a 50/50 water and isopropyl alcohol solution on a microfibre cloth works quickly and doesn't streak. Avoid ammonia-based sprays for regular use — they're effective for spot cleaning but leave a thin film over time.
Interior vs Exterior Frequency
Most homeowners clean interiors less frequently than exteriors because they're less visibly dirty from outside. In reality, interior surfaces in kitchens and living areas get surprisingly dirty. Annual interior cleaning is the minimum; twice yearly is ideal for most homes. If you cook regularly without full range hood ventilation, kitchen windows may benefit from more frequent attention. D&D Home Services offers interior and exterior window cleaning throughout Kitchener, Waterloo, Cambridge, and Guelph.
Key Takeaways
- ✓ Professional service saves time and delivers better results than DIY
- ✓ Regular maintenance protects your home's value and curb appeal
- ✓ D&D Home Services proudly serves Kitchener-Waterloo and surrounding areas
- ✓ Get a free no-obligation quote — call or book online anytime
Sources & References
- City of Kitchener — Property Maintenance Standards
- Ontario Building Code — Exterior Maintenance Guidelines
- D&D Home Services field experience across 500+ homes in KW Region
