It's easy to get used to the way your home's exterior looks. A little dust on the weatherboards, dark marks under the eaves or green growth on a shaded wall can build up so gradually that you barely notice it. Then you see a freshly washed house and realise just how much difference a proper clean makes.
So how often should you have your house washed? For many Melbourne homes, every 18 to 24 months is a useful starting point. The right timing depends on the finish, exposure and how quickly grime and organic growth return.
The baseline: every 18 to 24 months
For many rendered and weatherboard homes, a professional exterior wash every 18 to 24 months is a sensible maintenance routine. It removes built-up dirt, cobwebs and surface growth, brightens the appearance of the property and helps keep staining from becoming more established.
Some homes stay presentable for longer; others, particularly those with heavily shaded walls, benefit from more frequent cleaning. A few things make the biggest difference.
What shortens the interval
- Shade and aspect. In Melbourne, south-facing walls generally receive less direct sunlight, so shaded areas can stay damp for longer. That makes them more prone to visible algae and other growth. You may find one side of the house needs attention before the rest.
- Tree cover. Mature trees can be a lovely feature of a property, but they also cast shade and leave dust, pollen and debris on exterior surfaces. Homes in leafy Melbourne suburbs can need more regular washing, especially where branches overhang the house.
- Rendered surfaces. Rendered walls can show dirt, streaks and organic staining quite clearly, especially on lighter colours. Professional soft washing can lift this build-up without relying on the aggressive pressure that can damage vulnerable finishes.
- Proximity to the bay. Homes closer to Port Phillip Bay may also collect salt residue on exposed surfaces. Regular exterior washing helps remove this build-up along with everyday dust and grime.
The warning signs
Rather than working purely to a calendar, watch for these:
- Green or dark staining appearing on walls, particularly in sheltered or shaded areas. It can be a sign of organic growth, although not every dark stain is mould or algae.
- Cobwebs, dust lines and general grime built up around eaves and window heads
- Mould or dark discolouration on eaves, fascia and soffit boards
- Staining around window and door frames
- Uneven streaks beneath rooflines and window ledges, which can come from water carrying dirt down the wall. If gutters are overflowing too, it's worth arranging gutter cleaning as part of the maintenance
If the walls, eaves and exterior trim are looking tired, a professional house wash can make a noticeable difference to the whole property's presentation.
What actually happens if you leave it
The longer dirt and organic growth sit on a surface, the more noticeable the staining can become. A professional house wash removes that accumulated build-up and can reveal a cleaner, brighter finish beneath, often making a bigger visual difference than homeowners expect.
The method matters, too. Render, painted weatherboard and brick don't all respond to the same cleaning approach. At Brophy's Pressure Washing, I assess the material and its condition before choosing a suitable wash. Existing cracked render or failing paint may need repair rather than cleaning alone.
Why professional house washing? The right cleaning method can remove dirt, cobwebs and organic growth from exterior surfaces while taking care around paint, render and other finishes. It's a straightforward way to freshen the appearance of your home without automatically resorting to repainting.
Is an annual clean worth it?
It certainly can be. If your home sits under heavy tree cover, has shaded walls or collects salt and grime near the bay, an annual professional wash can keep it looking consistently well maintained. For other homes, an 18 to 24-month routine may be enough. The aim is to clean before the exterior looks noticeably tired, not wait until staining becomes extensive.
A practical approach
Take a look around your home every few months, particularly at the shaded walls, eaves, window surrounds and areas beneath trees. When dirt, cobwebs or organic staining start affecting the appearance, that's a good time to arrange a professional house wash.
A clean exterior can lift the look of the entire property, whether you're preparing to sell, welcoming guests or simply taking pride in your home. Regular washing also makes it easier to stay on top of the areas where grime tends to return.