The short answer: shopfronts monthly, offices quarterly, factories and warehouses every six to twelve months. That is the schedule most Melbourne sites land on once they have tried the alternatives. How often shop windows should be cleaned is really a question about how many people look at the glass every day, and what is landing on it between visits.
Commercial window washing is maintenance, not a one off tidy up. Here is how the intervals shake out by property type.
Shopfronts: monthly, sometimes fortnightly
A shopfront is the only part of your business that works on people who never come in. Fingerprints at handle height, dog nose marks near the bottom, dust and traffic film across the whole pane, and by week three the glass has a grey cast to it in flat light.
Monthly suits most retail. Go fortnightly if you are on a busy road with heavy customer traffic, if you run a food business where hands and steam hit the glass all day, or if you are in a strip where the neighbours keep their glass sharp and yours is the dull one in the row.
Cafes and takeaway shops are their own case. Grease carries in the air, settles on the inside of the glass and holds dust, so the inside needs the same attention as the outside. If your windows look clean from the footpath and dull from your own counter, that is what is happening.
Offices: quarterly for most, monthly at ground level
Office glass gets dirty slowly. Nobody touches it above the ground floor, so what accumulates is dust, rain marks and the film that settles out of city air. Getting those windows cleaned every three months keeps a tower or a suburban office looking maintained without spending money on glass that nobody stands in front of.
Two exceptions. Ground floor and lobby glass is a shopfront in every practical sense and requires monthly cleaning, because that is where clients and staff walk through it. And the internal windows in high traffic areas, meeting room partitions and glass doors, are worth doing more often than the exterior.
Factories, warehouses and industrial property
Once or twice a year is normal, and there is a good reason to do it at all beyond appearances. Dirty glass in a warehouse costs you daylight. Skylights and high panels covered in dust make the working areas darker, so the lights go on earlier and stay on longer.
Industrial sites also collect a specific kind of dirt, whether that is dust off a hardstand, exhaust film near the loading dock, or overspray from whatever the site does. Once it bakes on it takes longer to remove, which is the main argument for twice a year rather than once.
Aged care, medical and hospitality
These sit somewhere between the shopfront and the office. An aged care home or a medical centre is judged on how it looks by families deciding where to place someone, and the light coming through clean windows changes the whole environment for people who spend most of the day inside. Monthly to quarterly, depending on how much of the building the public sees.
Hotels, restaurants and function venues generally want monthly, and they want the work done before opening rather than during service.
What makes glass dirty faster in Melbourne
Salt is the big one near the water. From Brighton down through Beaumaris and around the bay to the Peninsula, salt carries on the wind, dries on the glass and leaves a haze that does not rinse off in rain. Bayside properties require a shorter cycle than an inland site of the same type, and salt left on frames and hardware does more than make the glass look dull.
Away from the coast it is dust, traffic film and construction. A site next to a building job or a busy arterial road requires a shorter interval for as long as that lasts. Sprinklers are the one people miss: bore water thrown at the glass every morning leaves mineral spotting that etches in if it sits for months, and by then it is a restoration job rather than a clean.
Why the interval matters more than the effort
Glass cleaned on a regular cycle stays easy to clean. Dirt sits on the surface and comes off with water and a squeegee. Glass left for a year or two lets that dirt bond, and salt and minerals start to etch the surface, and no amount of scrubbing brings back what has been etched.
The same goes for frames, sills and tracks. A professional window cleaner working to a schedule clears them each visit, so grit never builds up in the tracks and the drainage holes stay open. The building ages better and the maintenance budget stays predictable.
Setting a schedule that actually gets kept
Pick the interval that matches the property, then put it on a recurring booking so it happens without anyone remembering to organise it. The businesses that end up with consistently clean windows are the ones that stopped deciding each time.
Worth agreeing up front: which areas are included (exterior only, or interiors and frames as well), when the crew comes (before opening for retail, after hours for offices), how high the glass goes and what access it requires, and whether the same team returns each time. Continuity matters more than people expect, because a crew that knows the site knows which panes stain, where the tap is and which doors are alarmed.
If you have signage above the windows, get it done on the same visit. Fascia and light boxes fade under the same film that dulls the glass, and signage cleaning at the same interval keeps the whole frontage consistent.
Common mistakes with commercial glass
Cleaning in full sun is the classic. The glass dries before it can be squeegeed and you get streaks, which is why the best time of day is early morning or an overcast one. Using the wrong blade or a dry one drags grit across the pane and scratches it. Sprays that leave a residue create a film that attracts dust and dirt within days, so the windows look worse a week later than they did before.
People also ask about the best month to wash windows. In a coastal environment there is no best month, because salt does not take a season off. Get the windows cleaned on a cycle and the month stops mattering.
The other mistake is asking a general cleaner to do the windows as a side job. Commercial cleaning services and professional window cleaning services are different trades with different gear, and it shows on the glass under afternoon light.
If you want a straight answer on the right interval for your property, we will look at the site, the aspect and the traffic and tell you what it needs. We have cleaned Melbourne commercial glass for more than 20 years, we are fully insured and work at heights certified, and quotes are free. Call 03 8682 8767 or contact us about commercial window cleaning Melbourne wide.