Mould, mildew and algae: how exterior cleaning protects your home

Melbourne’s mix of wet winters, leafy streets and shaded corners makes homes a perfect place for mould, mildew and algae to grow. These stains look bad, but they can also cause damage if left untreated. Regular exterior cleaning helps keep your home safe and looking fresh.

Why mould, mildew and algae grow

• Moisture – rain, fog and damp soil keep walls and paths wet.

• Shade – south-facing walls and areas under trees get little sun.

• Organic matter – leaves, pollen and dust feed growth.

• Warm spells – mild weather after rain helps spores spread quickly.

Risks to your home

• Paint damage – mould eats away at paint and leaves lasting marks.

• Timber rot – mildew holds moisture against wood, breaking down seals.

• Slippery paths – algae create slick surfaces, raising the risk of falls.

• Curb appeal – green and black stains make a home look neglected.

How pressure washing helps

Soft washing with safe cleaning solutions clears mould and mildew without harming paint, render or timber. Pressure washing lifts algae and dirt from paths, driveways and decks. The right method depends on the surface, but both are effective when done by a professional.

Extra tips

• Trim back trees and shrubs to let sun reach walls and paths.

• Rinse down shady walls after heavy rain.

• Clear gutters so water flows away from the house.

• Book a soft wash every 12–18 months to prevent growth returning.

If you have mould, mildew or algae around your home, it may be time to book a professional clean. A safe wash protects your paint, timber and concrete while keeping your property looking its best.