How Often Should You Clean Your Windows in Sydney?

The Surprising Truth About Inside Windows

Most people assume the windows that need the most attention are the ones facing outside — the ones exposed to rain, wind, and whatever else the Sydney air throws at them. In practice, the opposite is often true.

Rain does some of the cleaning work for your exterior glass. A decent downpour rinses off loose dust and pollen. Nothing does that for your interior windows. Inside, the contamination builds silently — cooking grease drifting through the air as fine particles, fingerprints accumulating around every latch and handle, fly marks clustering near light sources, pet nose smudges at exactly the animal's head height. When I arrive at a property that hasn't been cleaned in twelve months or more, the inside windows are almost always the bigger job.

What I Actually Find When I Arrive

Outside

• A visible film of grime and environmental dust bonded to the glass
• Salt deposits that have begun crystallising on the surface (coastal properties)
• Soot and fine particulate from road traffic or aircraft flight paths
• Fly and insect marks dried hard into the glass
• Mould beginning to establish in the rubber seals and frame corners

Inside

• Airborne cooking grease that has settled across the surface and attracted dust
• Fingerprints, handprints and face smudges around every latch and handle
• Pet nose prints at the exact nose height of the household dog or cat
• Fly marks clustered near windows used as light sources at night
• Mould building in south-facing corners or any room with regular moisture

None of this is a criticism. It's just what happens in a lived-in home. The issue is how quickly it accumulates, and what some of it does to the glass if left long enough.

How Often Is Often Enough?

For most Sydney homes, the honest answer is: more often than you're probably doing it.

• Minimum: twice a year (every 6 months)
• Better:every 3–4 months
• Coastal properties: every 3 months without exception

Those are starting points. Where you live, what's around your property, and how your household actually uses the space all affect how quickly the glass gets dirty. The right schedule for a beachfront apartment in Bondi is not the same as for an apartment three streets back.

Why Coastal Properties Can't Wait

Salt from sea air lands on your windows constantly. You can't see it accumulating, but it's there every day. And unlike dust — which sits on the surface and washes away with rain — salt bonds to glass at a molecular level. Given enough time, it doesn't just dirty the glass. It etches into it permanently.

In Bondi or Coogee conditions, that etching can begin in as little as four or five months. Once it has happened, a standard clean cannot fix it. The glass is physically damaged. Restoration requires specialist abrasive polishing — expensive, and not always successful. Prevention is always the better option, and prevention means a three-month schedule for any property within roughly a kilometre of the ocean.

A Client Story: The View That Was Being Wasted

A few years ago I worked on a property in Coogee — a waterfront home with extraordinary harbour and ocean views from the main living areas. The interior was immaculate. The windows hadn't been properly cleaned in years.

The salt, grime and coastal contamination had built up to the point where those views — the reason someone had paid what they did for that address — were being experienced through a filter. It took a detailed clean to bring them back. When the client saw the result, they were quiet for a moment.

“They'd paid enough for that house — they deserved to properly enjoy the view.”

The Airport Suburbs Problem

For properties near Sydney Airport — Alexandria, Mascot, Zetland, Waterloo, Botany — the contamination is different but just as real. Aircraft emit fine carbon particulates that settle on every exposed surface beneath the flight path. On windows, this creates a grey film that doesn't look like ordinary dust and doesn't respond to rain.

If you live under or near a flight path and haven't thought about your windows recently, go outside on a bright day and look at a south-facing pane from an angle. What you see might surprise you.

A Country Comparison

I grew up in regional NSW, where windows genuinely got cleaned twice a year and that was adequate. Twice yearly made sense there — lower pollution, lower humidity, no salt air, far less traffic. The environmental load on glass was simply different.

Sydney is a different story, and the Eastern Suburbs in particular. The combination of coastal salt, urban pollution, humidity, and biological matter from proximity to parks and water means glass here accumulates contamination faster. Applying a country schedule to a city property — especially a coastal one — means falling behind.

What Affects Your Specific Schedule

Beyond location, here are the household-level factors that push windows toward needing more frequent attention:

• Ocean proximity— within 500m–1km of the coast, salt is your primary concern
• Busy roads— traffic contributes soot and fine particulate matter that films onto glass quickly
• Nearby building sites— construction dust is aggressive and accumulates fast; it can also be abrasive if left to sit
• Kids at home— fingerprints and face marks at various heights, every day, completely unavoidable and completely worth it
• Indoor pets— dogs and cats leave nose prints and paw smudges on glass at precisely their own height; if you have a dog, you know exactly what I mean
• South-facing or shaded windows — less sunlight means more moisture retention and more mould
• Trees nearby— pollen, sap, bird attractors, and organic debris all add to the load

No single factor is catastrophic on its own. But a coastal home with a dog, kids, a busy road nearby and some south-facing windows is going to need quarterly attention.

The Simplest Test

If you can't remember the last time your windows were professionally cleaned, go outside on a bright day and look at your glass from an angle. What you see is a reasonable guide to whether it's time.

You can use our free instant estimator to get a price range for your property, or read more about how we approach window cleaning if you'd like to know what the job actually involves.