Do Solar Panels Need Cleaning? Everything You Should Know

Last Updated: July 2026

In Australia, solar power systems are very popular for cutting bills and helping the environment, featuring top options like residential rooftop solar and commercial solar arrays. But the installation of a solar system is just the beginning of the process. There comes a question that many Australians ask: should solar panels be cleaned to ensure efficiency? or Do Solar Panels Need Cleaning? Well, solar panels don’t need much maintenance; however, the answer is still yes because dust, bird droppings, leaves, ash from bushfires, and coastal salt can cover them up and prevent light from reaching the solar cells.

Why Do Solar Panels Need Regular Cleaning?

The panels used in Australia are designed to last in different weather conditions like bright sunshine, rainfall and strong winds. Although they are designed to be robust, they become dirty due to various reasons. If you notice significant dirt buildup or reduced energy production, professional solar panel cleaning in Perth can help restore your system’s efficiency. 

Solar panels today are set at an angle where rain can easily remove any dust or dirt that may have settled there. However, the rain itself is not enough to wash off the stubborn dirt such as bird droppings, pollen, tree sap, and even salt that might be deposited on the solar panels.

How Dirty Solar Panels Affect Performance

The effects of dirt on the panels depend on how much of it and what sort of dirt is deposited on the panels. A light coating of dirt may not affect power production very much, while heavy accumulation may seriously affect electricity generation.

Main reasons for decreased performance are:

• Dirt resulting from dusty and windy weather
• Bird feces covering the solar cells
• Leaves and twigs providing shadowed areas
• Ash from bushfires on the glass cover
• Sea salts from coastal areas
• Air pollution and pollens

After inspecting hundreds of rooftop systems, we often find that coastal homes require more frequent inspections due to salt buildup. 

If one part of the solar panel gets heavily dirty, it affects the performance of the whole panel. Constant monitoring of the solar power system will help you detect a decrease in power generation which may be a sign that your panels require cleaning.

What Makes Solar Panels Dirty in Australia?

Various types of pollution differ depending on the region where the home is located in Australia.

Dust and Dry Climate

Rural and inland homes usually face the issue of wind carrying fine dust that falls on the solar panels. As a result, during periods when there is no rainfall at all, it can accumulate and decrease efficiency.

Bird Droppings

This type of pollution is one of the leading causes of cleaning solar panels by homeowners. It is not easy to wash away by rain, and it may totally cover some part of the panel.

Leaves and Other Vegetation

Homes surrounded by trees will face the problem of leaves, twigs, and sap accumulating on solar panels. Not only do they reduce the amount of sunlight falling on the panel, but also moistened leaves cause stubborn stains on the surface.

Bushfire Smoke and Ash

During the bushfire season, ash can fall on the rooftops and solar panels and stay there even when the smoke disappears reducing energy production until cleaning.

How Often Should Solar Panels Be Cleaned?

According to the Clean Energy Council, homeowners should regularly inspect panels for excessive dirt and debris. There is no one-size-fits-all cleaning schedule due to the unique environment of each household.

Here are some general guidelines:

• Suburban houses need to have their panels either cleaned or checked every 12 to 24 months.
• Houses located in rural areas and those where the environment is dusty should get cleaning every six to twelve months.
• For houses located near the sea, panel inspections should be conducted annually to ensure that there is no salt deposit.
• If your house has trees around or there are many birds, panel inspections should be conducted periodically every several months.
• Panel inspections are required for households affected by bushfires or severe weather.

Instead of following the schedule, many specialists advise you to monitor electricity generation and to keep an eye on your panels throughout the year.

Signs Your Solar Panels Need Cleaning

Sometimes dirty panels aren’t necessarily the sole indicator that they need to be cleaned.

Common indicators may include:

• Dust accumulation on the glass surface.
• Bird droppings that are still visible even after rain.
• Plants such as leaves and branches on top of the panels.
• Reduced power output in sunny conditions.
• Ash from bushfires and bushfire smoke.
• Coastal salt deposits.

If you’re receiving reduced power output on your inverter and/or monitor readings regularly, then cleaning the panels may improve things. Modern solar panels contain multiple solar cells connected in series. Heavy dirt covering even a small section can activate bypass diodes, reducing energy production from that section of the panel. 

Can You Clean Solar Panels Yourself?

Many households can clean their solar panels themselves, provided that the roof is accessible enough. However, safety is always first and foremost.

When cleaning gently, you will need:

• Water
• Soft sponge or microfiber cloth
• Soft bristle brush
• Ordinary garden hose with low-pressure water

Abrasive cleaners, harsh chemicals, steel wool, or high-pressure cleaners should not be used, as they can damage the layer of protection of solar panels.

The optimal time for cleaning the panels is either in the morning or in the evening, when they are cold. It is also not recommended to walk on them directly as it may harm the glass or photovoltaic cells.

When Should You Hire a Professional?

Professional cleaning is often the safest and most effective option for many Australian homeowners.

Consider hiring a professional if:

• The roof is steep.
• Your home consists of many floors.
• There is too much dirt or stains on your roof.
• You don’t feel comfortable with heights.
• Your installer advises professional cleaning.

The professional cleaning will employ specialized equipment, water purification systems, and safety practices while cleaning the panels. Due to varying levels of contamination, research has revealed losses of between less than 5% and over 20% in severely contaminated panels.

What is the Cost of Professional Cleaning in Australia?

The cost of professional cleaning may vary depending on some criteria such as roof access, number of panels, height of the roof, and your location.

For most household systems, the cost of professional cleaning is estimated to be between $150 and $300.

Although it is an extra cost, it might be worth the money, as cleaning your panels can help to save more energy.

Tips to Keep Solar Panels Cleaner for Longer

While the accumulation of dirt cannot always be avoided, some easy methods can lessen the need for frequent cleaning.

• Pruning trees around your home to minimize leaf drop.
• Installation of bird deterrents to stop nesting.
• Cleaning branches and debris after any storm.
• Tracking energy production of your solar system.

The above measures will help keep your solar performance good all through the year.

Common Solar Panel Cleaning Myths

Rain clears away everything: Rain will take care of loose dust, but usually leaves behind bird droppings, pollen, tree resin and salt.

Solar panels do not require any maintenance: The maintenance of solar panels is quite low, but regular inspections and cleaning will increase efficiency.

Using a pressure washer is safe: High pressure may damage protective layers, seals, and installation. So, gentle cleaning methods should be used.

Cleaning will improve the output greatly: Cleaning is beneficial when panels are visibly dirty. If the panels are already quite clean, then the effect on the production of electricity will be insignificant.

Conclusion

Maintaining the cleanliness of your solar panels is one easy thing that you can do to ensure the production of energy is efficient and that you make full use of your investment. Most households in Australia do not have to maintain their solar panels often, but regular checks can enable you to detect any dirt, dust or residues before they start interfering with the efficiency of your solar panels. It will help ensure that your solar panels continue producing energy efficiently.

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