Aluminium slat fencing is sold on "low maintenance" — and it earns it. But low maintenance isn't no maintenance. Dust, salt spray, bird droppings and tree sap all sit on the powder-coat, and left long enough they stain it. The good news: a proper wash takes under an hour for a typical run, needs nothing stronger than dish soap, and the one rule that matters is simple — never use anything abrasive or caustic on powder-coat. Here's the full routine.
For routine cleaning: hose the fence down, wash with warm water and a squirt of mild dish soap using a soft brush or sponge, rinse thoroughly, and let it air-dry. That's it. No special chemicals, no pressure washer, no scrubbing pads. Do this two to four times a year (more near the coast) and powder-coated aluminium will look new for decades.
Use:
Never use:
The test for any cleaning product: if you wouldn't use it on your car's paintwork, don't use it on your fence. Powder-coat and automotive paint fail the same way.
While you're at it, do a 60-second inspection: check post caps are seated, fixings are tight, and no slat has worked loose. Catching a loose slat early is a two-minute fix; ignoring it is a rattle that annoys you for years.
| Location | Routine wash | Detail (channels, caps) |
|---|---|---|
| Coastal (within ~1 km of the surf) | Every 2–3 months | Twice a year |
| Near-coastal / bayside | Every 3–4 months | Twice a year |
| Inland suburban | Twice a year | Once a year |
| Rural / dusty | Twice a year, or after dust storms | Once a year |
Salt is the accelerant: it doesn't rust aluminium, but salt crystals sitting on powder-coat trap moisture against the finish and dull it over time. Within sight of the ocean, the quarterly rinse is the single highest-value maintenance you can do — it takes twenty minutes with a hose and no soap at all.
| Stain | How to remove it |
|---|---|
| Dust and general grime | Routine wash — soap and water |
| Salt film | Plain hose rinse first; soapy wash if it's been months |
| Bird droppings | Soak with a wet cloth for a few minutes, then wipe — don't scrape dry, it scratches |
| Tree sap | Warm soapy water and patience; soften, don't pick. A plastic scraper at worst, never metal |
| Mould / mildew (shaded, damp spots) | Diluted pH-neutral house wash or a dedicated mould remover labelled safe for painted surfaces — rinse well |
| Hard-water spots | Dry the fence after washing instead of air-drying; existing spots usually lift with a damp microfibre |
| Paint overspray | Let it dry fully, then lift gently with a plastic scraper — or call the painter back |
| Scratches through the coating | Clean and touch up with matching powder-coat touch-up paint; deep scratches may need a professional respray of the panel |
If a stain won't shift with soap and a soft brush, stop — reaching for stronger chemicals is how coatings get damaged. A panel that needs more than soap probably needs a professional, not a harsher product.
Fold this into your routine wash and you'll catch every problem while it's small:
None of this is aluminium-specific — it's what separates fences that last 25 years from fences that look tired at 10. The difference is that on a timber fence this checklist comes with a repaint roster; on aluminium, the checklist is the maintenance.
Two environments deserve extra attention:
Our fencing is powder-coated for Australian conditions including coastal air — and if you're replacing a rusted steel fence near the ocean, aluminium is the material that ends the cycle. See the wood-grain, modern privacy and black batten ranges, all made to order in any height, profile and colour.
No — aluminium doesn't rust. What can happen is the powder-coat getting scratched or chemically damaged, exposing the metal underneath to staining. Keep the coating intact and there's nothing to rust.
Not recommended at close range. A pressure washer can etch powder-coat and force water into channels and fixings. A garden hose does the job safely.
Wash with warm soapy water first — that handles most of it. For stubborn mould in shaded spots, use a pH-neutral house wash or mould remover labelled safe for painted surfaces, then rinse thoroughly.
Yes, undiluted bleach and strong alkaline cleaners attack the coating. Stick to mild dish soap or pH-neutral cleaners.
15–25 years is realistic with basic washing. Coastal exposure and neglect shorten it; marine-grade coatings and regular rinsing extend it. Fading and chalking are the usual end-of-life signs, not rust.
Clean the area and touch up with matching powder-coat touch-up paint to seal the metal. For deep scratches across a visible panel, replacing the single slat is usually cheaper than a respray — one advantage of slat systems over welded panels.
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