The short answer.
Most Wānaka houses look right on two cleans a year: one after winter, once the worst of the frosts have gone, and one in late November before Christmas and the visitors arrive. That rhythm catches the two moments people actually notice their glass.
If you only ever book one, make it the spring one. Winter is when glass takes the most punishment here and gets looked at the least — wood smoke film, frost residue, and months of low sun angling straight through every mark on the pane.
What actually changes the answer.
Four things decide whether you need two cleans a year or four, and none of them are about how house-proud you are.
- Gravel or unsealed road frontage. Hāwea Flat, parts of Luggate, the back sections at Cardrona. Dust is relentless and it bonds to glass in a way that suburb dust does not. Three to four cleans a year is realistic.
- The nor'wester. If your place catches the full westerly you already know it. That wind carries fine grit off the paddocks and drives it into the frames and tracks, not just the glass.
- Bore or irrigation water. Sprinklers that hit the windows are the single fastest way to ruin a pane. Mineral-heavy water dries on hot glass and etches in. That is not dirt any more, and no amount of washing takes it off once it has gone far enough.
- Lake proximity. Close to the water you get a fine spray film that dust then sticks to. It builds faster than people expect.
Holiday homes and rentals are different.
If you let a place out, the cycle is not seasonal — it is guest-driven. Glass is the first thing a guest photographs and the first thing they mention in a review, because a dirty window is the one flaw you cannot avoid looking at.
For managed properties I usually work to a standing schedule tied to changeover gaps rather than a calendar. Most owners land on three or four visits a year, weighted before the ski season and before Christmas.
Signs you have left it too long.
You do not need to track dates. The glass tells you.
- White or rainbow-ish spotting that stays after rain dries — that is mineral, not dirt.
- Cobwebs rebuilding in the corners within days of you clearing them, which means the eaves have not been done.
- Tracks and sills holding grit, so the window grinds when it slides.
- Sun through the glass showing a haze rather than individual marks. Haze is soap film from a previous clean picking up dust.
Why the last one matters.
That final point is the reason I use a pure water system rather than detergent. Filtered water with the minerals stripped out dries off the glass leaving nothing behind — no soap, and therefore nothing for Wānaka's dust to key into.
It is also why people tell me the glass held up longer than they expected. It is not a better squeegee. It is that there is no film left for the next fortnight of dust to stick to.
Common questions
