If you live anywhere near the water on the Northern Beaches, you've seen it: a faint white haze on the glass a day or two after a southerly, or little spots that don't quite wipe away. That's salt — and it's the single biggest reason coastal windows need more attention than windows a few suburbs inland.
What sea spray actually does to glass
Every time the wind picks up off the ocean, it carries microscopic droplets of seawater inland. They land on your windows, the water evaporates, and the salt and minerals stay behind. On their own, a few crystals are harmless. The problem is the cycle: salt is hygroscopic, meaning it pulls moisture out of the air overnight, partly dissolves, then dries out again the next day. That constant wet-dry-wet-dry action is mildly abrasive, and over months it can etch tiny pits into the surface of the glass.
Catch it early and it wipes straight off. Leave it through a whole summer of sea breezes and those etched spots can become permanent — a cloudy, slightly rough patch that no amount of scrubbing will bring back. Frames cop it too: salt accelerates corrosion on aluminium tracks and pits the finish on powder-coated frames, especially on the weather-facing side of the house.
Why the Northern Beaches is a special case
Not every home is equal here. A place in Manly, Freshwater or Collaroy that looks straight out at the surf gets a heavy, near-daily dose of salt. Move a few streets back and behind a ridline and it drops off quickly. Then there's aspect: east and south-east-facing glass takes the brunt of the prevailing weather, so it's almost always the side that hazes up first.
It's worth knowing your own home's pattern. Most owners we work with can point to the two or three windows that always go first — usually the ocean-facing ones with no eave or balcony to shelter them. Those are the panes to keep an eye on.
How often should coastal windows be cleaned?
As a rough guide for the Beaches:
- Beachfront / first few streets (Manly, Freshwater, Narrabeen, Palm Beach): every 2–3 months. Salt simply doesn't get a chance to build up and bite in.
- A few streets back from the water: three to four times a year is usually plenty.
- Inland / behind the ridge: twice a year keeps things looking sharp.
The trick is consistency rather than waiting until the glass looks bad — by the time salt haze is obvious, it's already had weeks to start working on the surface.
Why pure water makes a real difference
This is where the cleaning method matters. We clean with a pure-water (deionised) system — water that's had its own minerals filtered out before it ever touches your glass. Because it's "hungry" for minerals, it lifts salt off the surface more effectively than tap water and a squeegee, and crucially it dries without leaving spots of its own behind. On salt-loaded coastal glass, that's exactly what you want: the salt comes off and nothing is left to dry back on.
Can you DIY it?
For ground-floor windows you can reach safely, absolutely — a regular rinse with clean water goes a long way to stopping salt building up, and it's a good habit between professional cleans. The two things to avoid: don't let it bake on all summer, and never dry-scrub a salty, gritty window, because you're effectively sanding the glass with the very crystals you're trying to remove. Rinse first, always.
For upper storeys, hard-to-reach panes, and the ocean-facing glass that needs doing most often, that's where it's worth handing over — both for the finish and for the safety side of working at height near the water.
Salt is just part of the deal when you live somewhere this good. The upside is that staying on top of it is straightforward once you know your home's pattern — and it's a lot cheaper than replacing etched glass down the track. If you're not sure how often your place needs doing, grab a free quote and we'll give you an honest steer based on exactly where you are and which way your windows face.