Home → Driveway stains
Driveway cleaning
How to get stains off a concrete driveway in Toowoomba
Red soil, rust spots, oil, leaf shadows, black mould and white powder all need different treatment, and the fix for one can set another in for good. Here is how to tell them apart, what actually lifts each one, and what the local rules say about where the water goes.
Get your free quoteStart here
Work out what the stain is before you touch it
Most Toowoomba driveways carry more than one stain at once, and each has a different cause. Hosing or scrubbing before you know which one you are dealing with usually spreads it, or drives it deeper into the slab. Match what you can see to one of these first.
Orange-brown haze across the whole slab, heaviest near garden beds and lawn edges: red soil.
Orange spots, rings or drip lines: iron. Usually lawn fertiliser, sprinklers running on bore water, or something steel left sitting on the concrete.
Dark, soft-edged patches where the car parks: oil, coolant or brake fluid.
Brown shadows in the shape of leaves: tannin from gum leaves and other leaf litter.
Black, green or grey on the shaded side: mould, algae, moss and lichen.
A white, powdery bloom: efflorescence, which is salt coming up out of the concrete itself.
Toowoomba's signature stain
Red soil: why hosing it just moves it around
Most of Toowoomba sits on basalt from the Main Range Volcanics, and the red soils that weather out of it are fine, iron-rich clays. The particles are small enough to work into the pores of bare concrete rather than sitting on top, which is why the stain survives a hose and a stiff broom.
Further west, out toward the Downs, the soil changes to black cracking clay. It does not stain orange, but it smears into a grey film and packs into joints and exposed aggregate.
What works is a rotary surface cleaner at the right pressure, which lifts the clay out of the surface evenly, followed by a thorough rinse. A hand wand held close does the opposite: it cuts clean stripes into the slab and leaves everything around them stained.
Rust and iron
Orange spots and rings: fertiliser, bore water and steel
Iron stains look like rust because they are rust. The usual sources around here are granular lawn fertilisers that contain iron, sprinklers running on bore water (dissolved iron turns orange-brown once it meets the air), and steel left on the slab: pot stands, trailer jacks, star pickets, a wheelbarrow.
Light iron stains respond to oxalic acid, sold at hardware stores as a wood bleach. Mix it to the label, keep the stain wet with it for two to three hours, scrub with a stiff non-metal brush, then rinse well. Oxalic acid is poisonous and burns plants, so keep children and pets away and keep it off the lawn and garden edges.
Deep or old stains usually need a poultice: a paste that holds the chemical against the concrete and draws the stain out as it dries. Expect more than one round.
Skip hydrochloric (pool) acid. It lifts rust, but it also etches and roughens the surface and can expose the stones in the mix. Whatever acid you use, rinse it off as soon as it has done its job, because it keeps working on the concrete after the stain has gone.
Prevention is simple: sweep fertiliser granules off the concrete before you water them in, and aim bore-fed sprinklers away from the slab.
Under the car
Oil, coolant and brake fluid
Fresh oil is the one stain where speed matters. Cover it straight away with something absorbent, such as cat litter, sawdust or a proprietary oil absorbent, leave it to soak, then sweep it up and bin it. Do not hose it: water spreads oil across the slab and carries it toward the gutter.
Old oil has soaked in. A concrete degreaser worked in with a stiff brush lifts the surface layer, and a poultice can pull more out of the pores. A stain that has been there for years will usually fade rather than vanish.
Catch the dirty rinse water. Degreaser and oil running into the gutter is exactly what the stormwater rules further down are about.
Leaves and trees
Brown leaf shadows and tannin stains
Wet leaves lying on concrete leach tannins that leave brown, leaf-shaped prints. It is worst under gums and on bush blocks around Highfields and the Range, where leaf litter sits on the slab through the wet months. Sun fades the marks slowly.
To lift them faster, use an oxygen bleach (sodium percarbonate) or a dilute chlorine solution, give it time to work, then rinse. Wet the garden edges before you start and rinse them again after. If the concrete is coloured or stamped, test a small hidden spot first.
The shady side
Black, green and grey: mould, algae and lichen
Toowoomba sits around 700 metres up, and fog and dew keep shaded concrete damp for hours each morning. That suits mould, algae, moss and lichen, and it is why the strip beside the house or under the carport goes dark first. Pressure on its own strips the visible layer but leaves the roots, so it comes back. Treat it to kill the growth, give it time, then surface clean. In winter, moss on paths and steps is a slip hazard, not just a mark.
White powder
Efflorescence: salt coming out of the concrete
A white, powdery bloom is efflorescence. Water moving through the concrete carries soluble salts to the surface and leaves them behind when it dries. It is common on newer slabs and on pavers.
Dry brushing or washing with clean water often clears mild efflorescence. Heavier deposits may need a mild acidic cleaner, tested on a small area first. Do not seal over it while it is still coming through.
What not to do
Six ways people make a driveway stain worse
Local rules
Water restrictions, and where your rinse water goes
Toowoomba Regional Council sets water restrictions town by town. As of October 2026, Toowoomba, Highfields, Westbrook, Oakey and Hodgson Vale are on Low restrictions, which allow cleaning with a trigger-nozzle hose or a high-pressure cleaner before 10am and after 4pm, any day except Monday. Cambooya is on High. Levels change, so check your town on council's current water restrictions page before you start.
Council's position is that only rainwater should go into the stormwater system, and it is an offence to deposit a contaminant into stormwater drains, roadside gutters or waterways. That water is not treated. Toowoomba sits across two catchments: the eastern side drains toward south-east Queensland, and the western side drains into the Condamine and on into the Murray–Darling Basin.
At home that means four things. Sweep up loose soil and grit before you wet anything. Soak up oil rather than hosing it. Block the low end of the driveway so dirty water cannot run into the street. And steer the rinse water onto lawn or garden, where the soil can filter it.
Common questions
Driveway stains, answered
Will a pressure washer get red soil out of my driveway?
Partly. A hand wand shifts the loose layer around and often leaves stripes. A rotary surface cleaner lifts the clay out of the pores evenly, and sealing afterwards is what stops it soaking straight back in.
Is it safe to use pool acid on my driveway?
We would not. Hydrochloric acid etches and roughens the surface and can expose the aggregate. Oxalic acid is the usual choice for rust stains, mixed to the label and rinsed off as soon as it has worked.
Why do orange spots keep appearing near my lawn?
Usually iron. Fertiliser granules left on the concrete and sprinklers running on bore water both leave orange marks. Sweep granules off the slab before you water them in, and aim sprinklers away from the concrete.
Can I clean my driveway during water restrictions?
Usually, within the allowed times. On Low restrictions a trigger-nozzle hose or pressure cleaner can be used before 10am and after 4pm, any day except Monday. Levels differ between towns in the region, so check council's page for yours.
How do I get an old oil stain off concrete?
Scrub in a concrete degreaser, then use a poultice to draw more out of the pores. A stain that has sat for years will usually fade rather than disappear completely. Soak up the dirty water instead of washing it into the gutter.
Should I seal my driveway after cleaning it?
On Toowoomba's red soil it usually pays off, because bare concrete takes the stain back in quickly. Seal only once the slab is properly clean and dry right through.
Next step
When a professional clean is worth it
Most single stains are a weekend job. Get a quote when the whole slab is stained, when there are several kinds of stain at once, when you want it sealed afterwards, or when the run-off needs managing on a sloping block. Driveway and path cleaning starts from $275 inc GST. Send a photo of the worst patch and we will tell you what it is and what it needs.
Get your free quote