Guide · Restoration
Faded, Chalky, or Turning Orange? That's Oxidation — and It Comes Off.
Some siding doesn't get dirty so much as it goes dull — hazed-over, chalky, the rich colour washed out to a pale ghost of itself. A blue or green metal roof can drift toward a strange orange. People assume it's dirt and try to wash it off, and nothing happens. That's because it isn't on the surface — it is the surface, slowly breaking down in the sun. It's called oxidation (also spelled oxidization), it can be brought back, but it's a separate job from a wash. Here's the honest version.
What oxidation actually is
Sunlight is relentless on the outside of a house. Over years, UV breaks down the very top layer of a surface — the plasticizers in vinyl, the binders in paint, the coating on a metal roof — and what's left is a fine, dull, powdery film of degraded material. That chalk isn't sitting on the siding like dust or algae. It is the siding, one worn-out layer of it. That single fact is the whole reason a wash can't fix it: there's nothing lying on top to rinse off.
How to spot it: the finger test
Wipe a dry finger firmly across the surface. If it comes away with a powdery residue the same colour as the wall, that's oxidation. A few other tells:
- It's worst where the sun works hardest — the south- and west-facing walls.
- It shows most on deep colours — blues, greens, and reds — which is the cruel part, because those are the homes that look best when the colour is true.
- It's even and gradual across a whole wall, not blotchy or streaky the way algae and mildew are.
On a metal roof, it looks different
Metal roofs oxidize too, and it can be alarming to watch. The factory paint chalks and loses its sheen, and darker colours — blue and green especially — can drift toward an orange or a washed-out whitish cast. That's the coating breaking down, the same process as siding, just up where you rarely get a close look. If your once-deep-green roof is reading orange from the driveway, it hasn't rusted through — it's oxidized, and often it can be brought back without recoating the whole roof.
Why a wash won't fix it
This is the part worth being clear about. A house wash removes organics — algae, mildew, dirt, the living and settled things that grow and land on a surface. A soft wash kills that growth at the root and rinses it away, and the colour underneath comes back because it was there all along, just covered.
Oxidation is the opposite situation. There's no film on top to remove — the dullness is the surface itself, worn down. So no amount of washing, soft or otherwise, changes it. If a company tells you a standard wash will "bring the colour back" on genuinely oxidized siding, they're either misreading the problem or overselling the wash. Restoring oxidation is its own process.
How we remove it
It's a restoration, not a rinse. An oxidation-dissolving detergent goes on at low pressure and is given time to dwell and soften the chalk. Then it's agitated by hand with soft brushes, panel by panel, and rinsed clean. Done properly, the original colour comes back evenly across the whole wall or roof face — no painting, no new siding, no replacement panels. It just takes patience and hands, which is exactly why it costs what it costs.
It's a separate add-on — quoted per job
Because it's slow, hands-on work, oxidation removal is a specialty add-on, not something folded into a standard house wash. In fact, gutter brightening — scrubbing the dull grey oxidation off the aluminum face of your eaves — is the very same job on a different surface; because eaves chalk on their own timeline, separate from the walls, that one gets booked on its own too. None of it is in the instant-quote tool, and none of it is included when you book a wash. We quote it from photos, per job, because the price swings with the surface, the colour, and how far gone it is. As a rough expectation, it's typically around the cost of a full house wash, sometimes more. Send a few photos to (705) 242-4888 and we'll give you a firm number.
The honest limits
Two things worth saying plainly. First, it isn't permanent — UV keeps working, so a restored surface will slowly chalk again over the years. What you're buying is the colour back now, evenly, without painting or replacing, and a clean slate that's easy to maintain. Second, some surfaces are simply too far gone: paint at the end of its life, or a roof coating that has fully failed, won't hold a restoration, and the honest answer there is recoating or replacement. We'll tell you which one you're looking at rather than sell you a job that won't last.
Frequently asked questions
Will a house wash remove faded or oxidized siding?
No. A wash removes organic growth sitting on the surface — algae, mildew, dirt. Oxidation is the surface itself breaking down, so there's nothing to rinse away. It's a separate restoration service.
Can you restore a faded metal roof?
Often, yes — if the coating hasn't fully failed. Blue and green roofs that have gone orange or chalky-white are classic cases. If the paint system is at the end of its life, restoration won't hold and recoating or replacement is the honest call.
Is gutter brightening the same as oxidation removal?
Essentially, yes — gutter brightening is oxidation removal on the aluminum face of your eaves, where UV chalks the finish to a dull grey. Same process as restoring siding or a metal roof. We book it separately, because eaves oxidize on their own timeline and can be brightened on their own.
How much does oxidation removal cost?
It's quoted per job from photos, since it varies by surface, colour, and severity. As a rule of thumb it's a specialty add-on that runs about the cost of a full house wash, sometimes more — it's hands-on work, not a flat-rate rinse, and it isn't in the instant-quote tool. Text photos to (705) 242-4888.
Is oxidation removal permanent?
No — UV never stops, so it slowly chalks again over years. It buys back the original colour evenly, without painting or replacing, and a fresh starting point that's easy to keep up.
Can I remove oxidation myself?
You can try an oxidation-removing product by hand on siding, but never reach for a pressure washer — it carves permanent streaks through the chalk. On a roof it's a real fall risk. When in doubt, send a photo first.