Sydney driveways are their own beast.

High-pressure washing combined with a surface cleaner attachment is generally the most effective way to lift oil stains, tyre marks and built-up grime from concrete driveways without streaking. For driveways with mould or black algae, often seen in shaded or damp areas around Sydney's leafier suburbs, a pre-treatment kill step before pressure washing gives a longer-lasting result. A flat surface cleaner also avoids the striping you get from a single wand pass.

Yes, using too high a pressure or holding the wand too close can erode paver joints, dislodge sand infill, or wear down the softer surface of sandstone, which is a common material in older Sydney properties. Sandstone in particular needs a lower pressure and, ideally, a soft wash approach to avoid pitting or accelerating natural wear. Repointing paver joints after cleaning is sometimes recommended if sand loss is heavy.

Oil stains generally need a degreasing pre-treatment applied and left to dwell before pressure washing, as water pressure alone often isn't enough to fully lift set-in oil from concrete pores. Older or heavier stains may need repeat treatment or a stronger degreaser. Complete removal isn't always guaranteed on very old stains, but significant lightening is realistic.

No, under Sydney Water and local council rules, wastewater containing detergents, oils or contaminants generally can't be discharged into stormwater drains, which flow directly to local waterways. Professional cleaners use containment methods like vacuum recovery or diverting runoff to sewer or garden areas to stay compliant. This is worth asking about if you're getting quotes, particularly for driveways that slope toward the street.

Most Sydney driveways benefit from a clean once a year, though shaded, damp or south-facing driveways in humid pockets like the Inner West or under tree cover can develop black spot mould faster and may need attention every 6 to 9 months. Regular cleaning also reduces slip risk, which becomes more noticeable once algae builds up. A light annual clean is far easier than removing years of buildup.

Yes, sandstone requires a gentler approach using controlled lower pressure and, in many cases, a soft wash treatment rather than aggressive pressure blasting, since sandstone is a soft, porous material common in heritage-era Sydney homes. A skilled operator will adjust pressure and technique specifically for sandstone rather than treating it the same as concrete. This protects the stone's surface and extends its lifespan.