A Practical Guide to Cleaning Exposed Aggregate Driveways

Exposed aggregate driveways combine durability with a textured finish, but the spaces between stones collect dirt, leaf residue and organic growth. In Caloundra, warm conditions, summer rainfall and shaded areas can encourage algae, making driveways slippery. Regular, gentle cleaning helps preserve the surface without loosening stones or damaging protective sealers.

Check the Driveway Before Cleaning

Inspect the driveway for cracks, loose aggregate, crumbling concrete and peeling sealer. These areas need extra care and may require repair before pressure cleaning. If the concrete is newly installed or recently sealed, follow the installer’s curing and cleaning instructions.

Sweep away sand, leaves and grit, then identify any stains. Oil, rust and organic growth require different treatments; increasing water pressure is not a reliable substitute for using the right cleaning product.

How to Clean Exposed Aggregate Safely

1. Prepare the area. Move vehicles and outdoor items, sweep thoroughly, and protect nearby electrical fittings. Keep children and pets away while cleaning.
2. Plan runoff control. Prevent dirty water, detergent and loosened sediment from reaching street gutters or stormwater drains. Use suitable containment and collection equipment where needed.
3. Apply a compatible cleaner. Choose a product labelled for concrete and suitable for any existing sealer. Follow dilution and dwell-time instructions, test an inconspicuous patch, and do not let the cleaner dry on the driveway.
4. Scrub gently. Work the cleaner into textured areas with a stiff nylon-bristle broom. Avoid wire brushes, which can scratch the surface or leave particles that rust.
5. Rinse with controlled pressure. Begin at the lowest effective setting with a wide fan nozzle, keeping it moving and well away from the surface. Avoid concentrated jet nozzles and direct spraying into cracks or weakened areas.

A compatible surface-cleaning attachment can improve consistency, but it still needs appropriate pressure and careful operation. There is no single pressure setting that is safe for every exposed aggregate driveway. Concrete condition, sealer type, nozzle choice and working distance all matter.

Treat Common Driveway Stains

Oil and Grease

Absorb fresh spills promptly with a suitable absorbent material and dispose of it appropriately. Treat remaining marks with a concrete-compatible degreaser. Older oil stains may need repeated treatment and may not disappear completely.

Algae and Mould

Use a cleaner specifically labelled for organic growth on concrete, checking its compatibility with sealers and nearby plants. Follow the safety directions and never mix cleaning chemicals, particularly chlorine-based products with acids or ammonia.

Rust and Leaf Marks

Use a stain-specific product approved for the surface. Avoid improvised acid treatments: acids can etch the cement paste surrounding the stones and alter the driveway’s appearance.

Manage Runoff in Caloundra

Stormwater drains discharge into local waterways without sewage treatment. Keep pressure-cleaning wastewater containing chemicals, oil or sediment out of the stormwater system. Before starting, check Sunshine Coast Council guidance on wastewater disposal and any current Unitywater restrictions affecting outdoor water use. Do not assume that biodegradable https://gregorysjec648.oakmontscope.com/posts/from-slippery-to-safer-cleaning-algae-off-garden-paths detergent is safe to discharge into a gutter.

Maintain the Finish Between Cleans

Sweep regularly, remove leaves before they stain, and address spills quickly. Check shaded sections after wet weather for slippery growth. Choose a mild, dry day for cleaning rather than working on a hot surface or immediately before heavy rain.

Once the driveway is clean and fully dry, assess whether the existing sealer needs attention. Resealing depends on wear, exposure and the product used—not a fixed annual schedule. A compatible sealer may reduce staining, but some finishes increase slipperiness when wet, so discuss suitable slip-resistant options with the supplier.

When to Use a Professional

Consider professional driveway cleaning in Caloundra if the surface has widespread slippery growth, stubborn stains, deteriorating sealer or difficult runoff conditions. Ask how the contractor adjusts pressure for exposed aggregate, protects landscaping and captures wastewater. A careful, surface-specific approach delivers a cleaner driveway while reducing the risk of costly damage.

Caloundra Pressure Washing

(07) 4120 7010