Solar panels generally need periodic cleaning to keep generating power efficiently. In the UK, experts recommend cleaning panels about once every 12–18 months to “keep them performing well”energysavingtrust.org.uk. Cleaning removes dust, bird droppings and other grime that can reduce the sunlight reaching the cells. However, the exact interval can vary based on local conditions. For example, solar panels on steeply pitched roofs (15° or more) often stay cleaner because rainfall naturally washes them sunsave.energy. Panels that lie flatter or are closer to the ground may accumulate dirt faster and need more frequent attention sunsave.energy.
- Southwest UK (e.g. Cornwall): Coastal winds bring salt spray, so owners may need more frequent cleaning than just rainy regions solar-panel-cleaners.com.
- Northern UK (e.g. Scotland): With plenty of rain and fewer sunny days, panels often self-clean. Even so, an annual check after dry spells ensures optimal performance.
- Rural areas: Farms stir up dust or pollen seasonally. In these areas, cleaning each spring (after pollen) and again in autumn (after harvest) is prudent.
Image: A technician using a soft brush on roof-mounted solar panels. Alt text: “Professional cleaning solar panels on a pitched roof.”
Homeowners should monitor panel output: if generation dips unexpectedly, it might indicate dirty panels. Some installers even offer maintenance plans. The Microgeneration Certification Scheme (MCS) notes that panels can operate for many years with minimal cleaning, but UKSPCA and industry experts find that annual cleaning is safer to ensure peak performanceenergysavingtrust.org.uk. In short, plan on about one clean per year as a rule of thumb, adjusting for extreme dust or local conditions.
For more cleaning advice, see our other articles such as Do Dirty Solar Panels Lose Efficiency?. And when you’re ready, use the UKSPCA Find a Cleaner service to connect with vetted professionals.
Image: Close-up of solar panels after rain, with water droplets visible. Alt text: “Solar panel surface with rain droplets and clean reflection of sky.”
Call to Action: Keep your solar investment producing power at its best – find a certified solar panel cleaner near you today on our Find a Cleaner directory.
