If the bottom of your windows, your limestone wall or the path beside the lawn has turned rusty orange, you're most likely looking at bore water stains. Bore water across much of Perth carries dissolved iron, and every retic cycle adds another thin layer.
The short answer: fresh, light staining often responds well to the right treatment for the surface. Older build-up, or glass that has started to etch, may only lighten. As a family-owned Byford team, we see bore staining on glass, paving and walls all the time, and the first step never changes: work out what the surface is before you put anything on it.
Why bore water leaves orange stains
The Department of Water and Environmental Regulation (DWER) says iron staining from garden bores is common in Perth: natural dissolved iron in groundwater reacts with air once it's pumped to the surface and leaves a rust coat on paths, buildings and fences. DWER's groundwater data also lists manganese and calcium as causes, so not every bore mark is orange (see the white crust note below).
Because the rust bonds to the surface, and soaks into porous limestone, brick and concrete, a hose or squeegee won't shift it, and the longer it's left the harder it is to remove.
Bore staining in Byford and Perth's south-east
Some larger blocks in Darling Downs, Byford, Mundijong and older parts of Armadale and Canning Vale run a private bore to keep big lawns green through summer, although DWER's garden bore advice lists areas in and around the Perth foothills as generally unsuitable for bores, because groundwater there is patchy. Under the garden bore rules for Perth and Mandurah, sprinklers can run on two rostered days a week from 1 September to 31 May, once a day before 9am or after 6pm, and must be off from 1 June to 31 August (the rules page has maps to confirm your area). So the staining season restarts every spring.
The State Government's garden bore FAQs point to the Perth groundwater map, which shows an iron staining risk for your address. DWER notes it has less data near the Darling Scarp and that neighbourhood bores should be checked to confirm local risk, so in Byford it's worth asking neighbours what they've seen.
Check what you're looking at first
Not every orange mark is bore water, and the pattern usually gives it away:
- Arcs or a band at sprinkler height on walls, glass or fences: bore water overspray.
- Scattered speckles on paving near the lawn: often fertiliser or sulphate of iron granules that got wet.
- Rings or squares: rusty pot bases or furniture feet.
- White, chalky crust: calcium or efflorescence (salts from masonry), not iron, and it needs a different approach.
For more on looking after exposed aggregate, see our guide to cleaning an exposed aggregate driveway.
Chemical safety for DIY stain removal
Whatever the surface, HealthyWA's household chemical advice covers the basics:
- Read the label every time and use only the exact amount it states. Twice as much won't be twice as effective, but may be twice as toxic.
- Never mix chemicals or products unless the label says to.
- Wear rubber gloves and eye goggles, keep children and pets away, and wash your hands afterwards.
- If you suspect poisoning, call the Poisons Information Centre on 13 11 26 (24 hours), or 000 if the person has collapsed.
Our own tip: if one product hasn't worked, rinse the patch thoroughly with clean water and let it dry before trying anything else, so two products never meet on the surface.
Avoid anything containing hydrofluoric acid (also listed as hydrogen fluoride or HF). WorkSafe WA warns it is rapidly absorbed through the skin, can cause deep, painful burns (with weaker solutions, pain may not start for hours) and can be fatal. Its uses include aluminium brighteners and etching glass. WorkSafe WA also flags products containing a bifluoride, such as ammonium, sodium or potassium bifluoride, which can produce hydrogen fluoride if an acid is present. Check the label on any heavy-duty rust or aluminium cleaner for any of these names.
Bore water stains on windows and glass
Glass usually responds best. Clean a small area, let it dry and run a fingertip over it. If the mark feels raised or gritty, it's a deposit and there's a good chance it will come off. If the glass feels smooth but still looks cloudy or pitted, it may be etched, and no cleaner will reverse that.
If you try a calcium, lime and rust remover, vinegar or a hardware-store bore stain remover:
- Wear gloves and eye protection, and never combine vinegar, a rust remover or any other product (see chemical safety above).
- Test an out-of-the-way corner first and follow the label exactly, including contact time.
- Protect aluminium frames, seals and painted sills. Many acid-based removers warn against aluminium and coated surfaces.
- Check with the installer before treating tinted film or coated glass.
- Skip abrasive pads, steel wool and razor blades or scrapers, which can scratch glass permanently, especially toughened glass.
- Work in the shade so the product doesn't dry on the glass.
For two-storey glass or a whole house of stained windows, our team cleans windows across Byford, Armadale and nearby suburbs, is Working at Heights certified and finishes with a purified water rinse that won't leave new mineral spots. See what's included in our window cleaning.
Paving, concrete, brick and render
On driveways, paths and walls the rust sits in the pores, which is why water pressure alone rarely shifts established staining. It needs a rust or bore stain remover labelled for that surface (concrete, pavers or brick), time to work, then a controlled rinse.
- Brick and render are porous, and render may be painted. Test a hidden patch.
- Wet nearby plants before and after, and keep runoff out of street drains. Street drains feed into the stormwater drainage system, which the Water Corporation says carries stormwater into rivers, lakes or the ocean.
- Go easy with a hired pressure washer. A narrow nozzle held too close can scar concrete, pavers and mortar joints.
Large driveways, rendered walls and commercial forecourts are where our high pressure cleaning earns its keep, with pressure and treatment matched to each surface.
Limestone and natural stone: go gently
Limestone needs the most care. Geoscience Australia describes the Tamala Limestone along Perth's coast as a soft porous rock that is highly susceptible to being dissolved by weakly acidic water, even rain. Many rust removers are acid-based, so the wrong product can etch the wall and leave dull patches that stand out more than the stain did.
- Patch test a hidden block and let it dry fully before judging.
- Only use a product labelled as suitable for limestone or natural stone.
- On sealed stone, a remover may strip or mark the sealer.
Our honest view: a stain that's only lightened beats a clean wall that's been etched.
Alfresco and pool-surround tiles
Outdoor tiles and pool surrounds often stain in the sprinkler splash zone, and grout picks up colour faster than glazed tiles. Treat them like paving: identify the material, test first, rinse well. Around pools, keep acid-based removers and their runoff out of the water and well away from pool chlorine: Safe Work Australia warns that pool chlorine releases poisonous chlorine gas on contact with acid. Tiled alfrescos and pool surrounds are part of our pressure cleaning work.
Indoors, garden bore water rarely reaches the tiles, so stained indoor grout usually has another cause. For that, our tile and grout cleaning includes optional sealing, which makes grout easier to keep clean but not stain-proof.
How to stop new stains forming
- Stop the overspray. DWER recommends sprinklers that avoid overspray and run-off, such as drip-line in garden beds. Re-aim or lower heads that hit walls, glass or paving.
- Clean little and often. One season's film is far easier to shift than years of layers, so if your windows or paving cop regular overspray, clean them every few months.
- Ask about treating the water. Iron filtration is a job for a bore or irrigation specialist, and we don't supply or install it. For irrigation and bore maintenance, troubleshooting and repairs, the State Government's garden bore FAQs suggest an endorsed Waterwise Garden Irrigator or Waterwise Irrigation Design Shop.
When it's time to call us
DIY is fine for a few marks on a ground-floor window or a small patch of path. Call us when the staining covers large areas, sits on two-storey glass or render, involves limestone or a mix of surfaces, or a product you've tried hasn't worked.
We'll assess it on site, tell you honestly what's likely to come off and what may only lighten, and quote before any work starts. We can't promise full removal, especially on older or etched staining, but you'll know what to expect. See our bore stain and scarp dust cleaning in Byford, our Armadale and Canning Vale pages, or all the areas we cover.
Renting?
Consumer Protection WA explains that property condition reports show a home at the start and end of a tenancy, so check whether staining was noted at move-in (general information, not legal advice). If you're moving out, our end of lease cleaning covers the specialist parts, including windows, tracks and outdoor pressure cleaning, quoted per job. For the rest of the move-out, see our WA final inspection checklist.