There is no single right answer to how often windows should be cleaned — but in Christchurch, the climate answers most of it for you. Salt haze off Pegasus Bay, nor'wester dust blowing in from the plains, spring pollen, and winter condensation on single glazing each attack your glass in different seasons. The trick is matching your cleaning rhythm to the conditions your place actually faces.
The short answer for most homes
For a typical Christchurch family home, twice a year keeps glass looking genuinely good rather than just "not terrible". A spring clean clears the winter build-up — condensation streaks, heater film on interior panes, and the grey layer that settles over everything from June to August. An autumn clean then removes summer dust and pollen and sets you up with maximum light for the darker months, when clean glass genuinely makes rooms feel brighter and warmer.
Homes closer to the coast — New Brighton, Sumner, Redcliffs, the estuary edge — cop salt spray that bonds to glass if left too long. If you can taste salt on your car, it's on your windows too, and twice-yearly is the minimum. Three times a year, adding a mid-summer rinse of the ocean-facing elevations, keeps salt from etching into the surface over time.
When more often makes sense
Some situations push the rhythm up. Homes on busy or unsealed roads collect road film and dust far faster than quiet cul-de-sacs. New subdivisions spend their first year or two surrounded by construction dust — fine concrete and plaster particles that settle on every pane within a few streets of active building sites. If you're selling, a pre-sale clean a week or two before photography pays for itself in brighter listing photos alone.
Rentals sit in their own category. A change-of-tenancy clean protects both parties: landlords get glass documented in good order, and incoming tenants start with full light. Property managers running several homes often bundle exteriors into a regular round — see our residential window cleaning service for what's included — because consistent glass across a portfolio is cheaper than restorative scrubbing after years of neglect.
Businesses run on a faster clock
Shopfronts and hospitality glass live or die by first impressions, and fingerprints, street dust and bus-stop grime accumulate in days, not months. High-foot-traffic frontages in the central city usually need weekly or fortnightly attention, while offices and showrooms can sit comfortably on a monthly or quarterly cycle. Our commercial cleaning rounds are built around trading hours so the work never interrupts your day.
The cost of waiting too long
Glass is tougher than it looks, but neglect has compounding costs. Bonded salt, concrete splatter and long-baked bird fouling can etch or stain glass permanently, turning a standard clean into specialist restoration — or replacement. Gutters overgrown enough to overflow can stain walls and rot fascia boards, which is why many clients pair windows with our gutter clearing service in the same autumn visit. Regular maintenance is nearly always cheaper than rescue work.
So what should you book?
Start with where you live and what you notice. Coastal or dusty street? Book three times a year. Quiet inland suburb with double glazing? Twice yearly will keep you delighted. Running a shopfront? Talk to us about a standing round. And if you genuinely can't remember the last clean, book one now and judge the rhythm from how long the sparkle lasts — your glass will tell you when it's ready again.
Frames, sills and seals age too
Frequency isn't only about the glass. Aluminium joinery chalks and pits when salt and grime sit on it for years, timber sashes swell and stick when condensation pools in the rebates, and rubber seals perish faster under a permanent coat of grit. A regular wash that includes frames and sills — wiped, not just rinsed — protects the whole window unit, not just the view through it. When we clean, we also spot the early warnings: perished putty, cracked seals, weep holes blocked with paint, and the tell-tale fogging between panes that means a double-glazed unit has failed. Catching those at cleaning time turns a maintenance visit into cheap insurance against joinery repairs.
A yearly rhythm that sticks
The easiest schedule is one you don't have to think about. Book the spring clean when the clocks change and the daylight returns — you'll see the difference immediately as low sun rakes across the glass. Book the autumn clean after the ANZAC Day winds have stripped the last leaves, and pair it with a gutter clear while the ladders are up. Coastal homes add a January rinse of the sea-facing elevations after the holiday salt build-up. Put all three in the calendar as repeating events, and window cleaning stops being a chore you notice and becomes maintenance that simply happens — which is exactly how the best-kept homes in every Christchurch street manage it.