How to Remove Mould from Driveway?

A mouldy driveway is more than just an eyesore. For many Aussie homeowners and tenants, it’s a slippery hazard, a potential cause of concrete damage, and even a factor in bond disputes. In fact, driveways left with black mould or green algae can quickly become unsafe, especially during rainy months. The good news? With the right approach and a little know-how, you can get your driveway clean, safe, and looking fresh again — all while preventing the mould from returning.

Whether you’re tackling a small patch or a large driveway, this guide will walk you through step-by-step techniques, the best cleaning solutions, and maintenance tips to keep your surface spotless. By the time you’re done, you’ll understand which methods work, what tools you need, and when it’s worth calling in the professionals.

Understanding Mould on Driveways

Mould, algae, and moss thrive in damp, shady areas. Driveways are perfect breeding grounds, especially if water pools in low spots or leaves and debris are left to sit. Over time, the growth can turn your once-pristine concrete into a slippery, green or black surface.

Left unchecked, the consequences go beyond looks. Slips and falls are a real safety concern for families, tenants, and visitors. Mould can also erode concrete over time, causing surface damage and increasing maintenance costs. For renters, a mould-covered driveway can even be a source of stress during exit inspections, with landlords citing cleanliness issues as grounds for bond deductions.

There are different types of growth you might encounter:

• Black mould: Often found in shaded, damp areas, can be stubborn and potentially harmful if spores become airborne.
• Green algae: Common on older, porous concrete; slippery when wet.
• Moss: Thrives in extremely shady, moist spots and can grow in cracks.

Knowing the type of growth helps you pick the right cleaning method — what works on green algae may not be strong enough for black mould.

Safety First

Before you start scrubbing and spraying, protect yourself and others. Wear gloves, eye protection, and non-slip shoes. Keep children and pets away from treated areas until surfaces are completely dry. Using chemicals without proper protection can irritate skin and eyes, so it’s essential to follow instructions carefully.

Even if you prefer eco-friendly solutions like vinegar or baking soda, safety precautions still apply. And if you’re using a pressure washer, ensure you’re familiar with its operation to prevent injuries or accidental damage.

Tools and Supplies You’ll Need

To remove mould effectively, you’ll need a few basic items:

• Pressure washer or garden hose: Low-pressure is safer for DIY jobs; professionals may use high-pressure washers for deep cleaning.
• Stiff bristle scrub brush: Essential for stubborn spots and corners.
• Cleaning solutions: Vinegar, baking soda, or commercial moss and mould removers.
• Bucket, gloves, and eye protection: To mix and apply solutions safely.
• Optional: Moss and mould remover from Bunnings or Coles for particularly tough growth.

Choosing the right products is crucial. Some chemicals can damage concrete or harm nearby plants, so always check the label and test in a small area first.

Step-by-Step Cleaning Process

Step 1: Prep the Area

Start by removing debris such as leaves, twigs, or dirt with a broom or leaf blower. Wet the surface lightly to prevent dust and reduce airborne spores during cleaning. Preparing the area properly makes the cleaning process faster and more effective.

Step 2: Apply the Cleaning Solution

For light mould or algae:

• Vinegar solution: Mix 1:1 vinegar and water.
• Baking soda paste: Great for stubborn black mould.

For heavy growth, a commercial moss and mould remover is ideal. Apply the solution evenly and allow it to sit for 5–10 minutes to break down the growth. Avoid leaving it too long, as some strong chemicals can damage concrete or nearby plants.

Step 3: Scrub or Pressure Wash

Use a stiff-bristled brush to scrub the surface, focusing on persistent patches. If using a pressure washer, start on a low-pressure setting and keep the nozzle moving to avoid etching the concrete. For large driveways, working in sections ensures even cleaning.

Rinse thoroughly with water. Residue left behind can encourage regrowth or create a slippery film. If stubborn spots remain, repeat the process until clean.

Step 4: Rinse and Dry

Once scrubbing is complete, rinse the entire driveway thoroughly. Allow it to dry completely — usually 24–48 hours depending on weather conditions. A dry surface ensures any remaining spores are neutralised and prevents immediate regrowth.

Step 5: Inspect and Repeat if Needed

Check for any missed patches. Some shaded or low-lying areas may require a second treatment. Repeat cleaning only as necessary, following the same precautions each time.

Prevention and Maintenance

A clean driveway is easier to maintain than one left to develop mould repeatedly. Here are some simple strategies:

• Trim overhanging trees: Sunlight reduces moisture and prevents growth.
• Improve drainage: Water should not pool in low spots.
• Regular sweeping: Removes leaves and dirt that trap moisture.
• Anti-mould sealers: Consider applying concrete sealers or EnduroShield coatings to create a protective barrier.
  

Scheduling maintenance at least twice a year helps prevent thick, stubborn growth and keeps your driveway looking neat year-round.

When to Call in the Professionals

While DIY methods work for many driveways, there are situations where a professional cleaner is worth considering:

• Large driveways or difficult-to-reach areas.
• Persistent black mould that doesn’t respond to DIY methods.
• Concerns about damaging concrete with pressure washing.
• Tenants who want a bond-back guarantee from a certified bond cleaning service.

Professionals have industrial-grade equipment and safe, effective chemicals that ensure thorough cleaning without harming surfaces or plants.