How to Clean
a Colorbond Fence
Water, a soft brush and mild detergent, twice a year. Everything beyond that risks the coating. Here is the method, and the four things never to use on it.
How to wash it without wrecking it
Hose it down, wash with a soft brush or sponge and warm water with a little mild detergent, then rinse thoroughly. That is the whole method. Colorbond needs no treatment, no coating and no polish, and almost everything sold to "restore" it does more harm than good.
Twice a year is plenty for most Melbourne properties. Within a few streets of the bay, make it four times, because salt sitting on the surface is what leads to tea staining and eventually to corrosion at any exposed edge.
Rinsing properly matters more than the washing. Detergent left to dry on the surface leaves a film that attracts more grime and, in some cases, marks the finish. Rinse from the top down and keep going after you think you are done.
One thing to watch for: not every mark is dirt. Orange-brown staining that will not wash off, particularly along the bottom edge, is usually rust, and rust means the coating has been breached or the sheet is sitting in soil. That is a repair question, not a cleaning one.
What is safe on Colorbond, and what is not
The coating is what makes Colorbond last twenty-five years. Everything in the second column attacks it.
| Use | Avoid | Why |
|---|---|---|
| Soft brush or sponge | Scouring pads, wire brushes, steel wool | Abrasives scratch the coating and expose the steel |
| Warm water and mild detergent | Solvents, turps, petrol, thinners | Solvents soften and lift the paint system |
| Garden hose | High-pressure washers at close range | Pressure can drive water into joins and lift edges |
| Diluted household detergent | Bleach, acid or alkaline cleaners | Strong chemicals discolour the finish and void warranty |
| Thorough rinsing | Letting detergent dry on the surface | Dried detergent films mark the finish |
| Soft cloth for stubborn marks | Scraping with a blade or scraper | Any breach of the coating becomes a rust site |
BlueScope warranties have conditions about maintenance and about what the surface is exposed to. If a fence is under warranty, checking the terms before using anything unusual on it is worth the five minutes.
When it is not just dirt
Four marks that need something other than a wash, and what they are telling you.
| What you see | What it is | What to do |
|---|---|---|
| Green or black patches in shade | Mould or algae | Diluted mild detergent, soft brush, rinse well |
| Orange-brown streaks at the base | Rust from the sheet sitting in soil | A repair issue. Washing will not stop it |
| Fine rust freckles near the coast | Tea staining from salt deposits | Wash more often. Rinse with fresh water |
| Chalky, faded surface | UV weathering of the coating | Normal with age. Nothing to apply, and no fix |
Rust at the bottom edge is the common one and the important one. It means the coating has been breached where the sheet meets the ground, and it will keep travelling along the run.
Four things worth knowing
Cleaning a Colorbond fence is genuinely simple. These are the things people get wrong anyway.
Keep the base clear, not just clean
Mulch, soil and garden beds piled against the bottom edge cause the rust that no amount of washing will fix. Clearing them back is worth more than any cleaning routine.
Pressure washers are risky
At close range a pressure washer can drive water into the joins between sheets and lift the edges of the coating. If you use one, stand well back and keep it moving.
Coastal fences need it more often
Salt is not just dirt: it holds moisture against the surface. Near the bay, rinsing with fresh water every few months does more for the fence than any product.
Rust means something structural
If washing does not shift orange staining at the base, the sheet is in contact with soil or mulch. Clearing the ground back and fitting a plinth addresses the cause; washing does not.
Harsh cleaners can void it
BlueScope warranties come with conditions. Solvents, acids and abrasives can put a claim at risk. Mild detergent and water keeps you inside the terms without exception.
Colorbond repairs across Melbourne
Bayside
Known for Bayside, Glen Eira and Port Phillip councils.
Hose it down, wash with a soft brush or sponge and warm water with a little mild detergent, then rinse thoroughly from the top down. Nothing else is needed and most other products carry some risk to the coating.
Related guides
How Long Does a Fence Last?
What actually determines a Colorbond fence lifespan.
Read more GuideHow to Install a Colorbond Fence
The base detail that prevents rust in the first place.
Read more GuideWhen to Replace a Fence
Whether rust at the base means repair or replacement.
Read more ComparisonColorbond vs Aluminium
If salt exposure is your ongoing problem.
Read more ComparisonCompare Fence Types
Every material on maintenance and lifespan.
Read more
Rust that will not wash off?
If the base is corroding, cleaning will not stop it. We will look at it and tell you whether it is a panel repair or a replacement.