Chalky window frames: that white powder is oxidation, and washing will not fix it
White powder on your finger is oxidation — the anodised or powder-coat surface breaking down under UV and salt, not dirt sitting on top of it. A clean removes the loose chalk, takes the salt off, and slows the next round. It does not restore the finish. Once the coating has failed through, only a re-coat brings the colour back.
The finger test settles it in one wipe
Run a finger down the frame. If it comes away with a pale, powdery film — chalky white on a bronze frame, ghost-grey on a black one — that is not dirt. That is the coating itself, breaking down and coming off in your hand. Powder-coated aluminium is pigment held in a resin binder, and ultraviolet light attacks the binder from the day the frame goes in. As the binder degrades, the pigment loses its grip and sits loose on the surface as chalk.
Anodised frames get there by a different road. Anodising grows a hard oxide layer on the aluminium and seals it; weather slowly opens that seal, and the exposed layer weathers to a dull, powdery bloom. Either way the tell is identical. Dirt wipes off dark and stays off for months. Chalk wipes off pale, leaves a clean stripe where your finger went, and is back on the surface within weeks. The frame is not dirty. The frame is wearing out.
The weather side goes first, and salt gets it there sooner
Walk the house and the pattern is obvious. Frames facing north and west — full sun, no eave over them, nothing shading the top rail — are the chalky ones. Frames on the south side, or tucked under a deep verandah, still read close to new. Same house, same age, same coating, same installer. The only variable is how many hours of ultraviolet each elevation has absorbed. That is why one bedroom window looks tired and the one around the corner does not.
Salt speeds all of it up. On the beaches and the harbour foreshore, marine aerosol settles on the frame and keeps the surface damp and salty between rain events, so the coating spends more of its life under load. A frame in Manly or Vaucluse chalks visibly earlier than the same product in Killara, and the seaward elevation is always the one that goes first. Rain helps less than you would hope — it rinses some salt off, dries, and leaves the rest sitting there.
A wash removes the chalk, not the cause
A proper clean does three real things. It lifts the loose chalk, so the frame reads as one even colour instead of a blotchy bloom. It takes the salt and grime off, which removes the accelerant. And it clears the tracks and sills where shed powder collects and turns to grey paste in the first rain. Frames look markedly better afterwards, and the improvement is not cosmetic theatre — from two metres away most people would call it fixed. It is worth buying, on its own terms.
What a clean cannot do is give the coating back. The binder that has broken down is gone, and underneath the chalk is a surface that has lost its gloss permanently. No amount of washing, waxing or effort restores it. Aggressive attempts make it worse: cutting compounds, abrasive pads and high-pressure water strip away what is left of the coating and expose fresh binder to the sun. If someone offers to buff your frames back to new, they are sanding off the finish you still have.
When the honest answer is a re-coat, not a booking
There is a point where a clean is the wrong purchase, and we would rather say so before you pay. If the colour has gone patchy across a whole elevation, if bare aluminium is showing through, if there is white pitting in the metal itself, or if the chalk is back within a month of every wash — the finish has failed. Cleaning it is maintenance on something that no longer exists. You will spend the money and be annoyed again in six weeks.
The fix at that stage is a coating, not a wash. Either a specialist re-coat applied on site, or pulling the frames and having them re-powder-coated. Both are refinishing trades, not cleaning ones, and Schmick does not do them. We will tell you that on the day rather than take the booking and hope you do not notice. That candour costs us a job now and then. It costs a great deal less than a customer who paid us to clean a frame that needed painting.
Where a wash still earns its money, and what it costs
Most Sydney homes are nowhere near that point. The frames are chalking slowly, on two or three elevations, and everything else is sound. That is exactly where washing pays for itself. Take the chalk and the salt off a few times a year and the surface stays evener, the tracks stay clear, and the coating gets a longer run before re-coating becomes the conversation. Near the water, three times a year. A few ridgelines back in Gordon or St Ives, once or twice holds fine.
Frames and tracks come with the glass on a Schmick window clean. Window cleaning starts at $150; most single-storey homes land between $150 and $550 depending on window count, and two storeys adds about 40%. Bundle it with gutters or a house wash on the same visit and you save 5-15%, or the Keep plan at $89 a month puts the schedule on us. The instant quote returns a firm, bookable price in about 60 seconds, and it holds unless the place is materially different.