Clean and Shine: How Often Should You Clean Your Solar Panels in the UK?

Clean and Shine: How Often Should You Clean Your Solar Panels in the UK?

Man cleaning a solar panel with the sun gleaming behind him.

Solar panels are a sustainable and cost-effective way to generate clean energy for your home or business in the UK. However, to ensure optimal performance and efficiency, it’s essential to keep your solar panels clean and free from dirt, debris, and other contaminants. But how often should you clean your solar panels? In this blog, we will explore the factors that influence the cleaning frequency of solar panels in the UK, helping you maintain their effectiveness and maximise energy production.

Location and Surroundings:

The frequency of solar panel cleaning depends on the location of your property and the surrounding environment. Factors such as proximity to main roads, construction sites, industrial areas, or agricultural fields can contribute to a higher accumulation of dust, pollen, or pollutants on the panels. If your property is located in an area prone to high levels of air pollution or dust, you may need to clean your solar panels more frequently.

Seasonal Variations:

Seasonal changes can impact the cleanliness of your solar panels. In the UK, rain is the primary natural cleaner for solar panels, washing away some of the dirt and debris. During the rainy season, your solar panels may require less frequent cleaning as the rain helps keep them relatively clean. However, in drier months or during extended periods without rainfall, dust and dirt can accumulate, necessitating more regular cleaning to maintain optimal performance.

Tilt Angle and Self-Cleaning Properties:

The tilt angle of your solar panels also affects the cleaning frequency. Solar panels installed at steeper angles (greater than 20 degrees) are generally more self-cleaning as rainwater can easily wash away debris. Panels installed at shallower angles may require more frequent cleaning as rainwater may not effectively remove dirt and debris. Additionally, some solar panels are designed with self-cleaning properties, such as anti-reflective coatings or smooth surfaces that help prevent dust buildup. If your panels have these features, they may require less frequent cleaning.

Monitoring Performance:

Regularly monitoring the performance of your solar panels can indicate whether they require cleaning. If you notice a significant decrease in energy production compared to previous periods or your system’s predicted performance, it may be a sign that your panels need cleaning. Monitoring systems or inverters can provide data on energy generation, allowing you to track any decline in output that may be due to dirty panels.

Professional Cleaning vs. DIY:

When it comes to cleaning your solar panels, you have the option of DIY cleaning or hiring professional services. DIY cleaning can be done using a soft brush, gentle soap, and a hose. However, if your solar panels are installed at heights or difficult-to-reach locations, it may be safer and more effective to hire professional cleaners who have the necessary equipment and expertise to ensure a thorough and safe cleaning process. Professional cleaning services can also provide additional inspections and maintenance checks to keep your solar panels in optimal condition.


In the UK, the frequency of solar panel cleaning varies depending on location, surrounding environment, seasonal changes, tilt angle, and self-cleaning properties. It is generally recommended to inspect and clean your solar panels at least once or twice a year. However, if you notice a decline in energy production, live in an area with high levels of air pollution, or experience extended periods without rainfall, more frequent cleaning may be necessary. Regular monitoring of your system’s performance and considering professional cleaning services can help ensure your solar panels are operating at their best, maximising energy production and your return on investment in clean and sustainable energy.