With solar panels becoming increasingly common across Buckinghamshire homes, many homeowners are asking: does cleaning your solar panels actually make a difference? The short answer is yes — and the evidence is compelling. In this guide, we explore how dirt and grime affect your solar panel output, and how regular professional cleaning can pay for itself.
How Much Efficiency Do Dirty Solar Panels Lose?
Studies have consistently shown that dirty solar panels can lose between 15% and 25% of their energy output due to the accumulation of dirt, bird droppings, moss, lichen, and general pollution. In areas like Buckinghamshire, where we experience a mix of pollen seasons, autumn leaf fall, and frequent rainfall, this build-up can happen surprisingly quickly.
Even a thin layer of dust or a few bird droppings can create “shading” across your panels, significantly reducing their output. Solar panels generate electricity based on the amount of light hitting the photovoltaic cells — anything blocking that light directly reduces your energy generation.
Does Rain Clean Solar Panels?
Many homeowners assume that rain keeps their solar panels clean — but this is a common misconception. While light rain can rinse away loose dust, it often leaves behind mineral deposits and spreads bird droppings rather than removing them. In fact, rain water frequently leaves a film of grime that can be worse than the original dirt once it dries.
How Are Solar Panels Professionally Cleaned?
At MPF Exterior Cleaning, we use a pure water fed pole system to clean solar panels safely and effectively. This involves:
- Purified (deionised) water: Unlike tap water, pure water leaves no mineral residue, resulting in a streak-free finish.
- Soft brush agitation: Gentle brushing removes stubborn deposits without scratching the panel surface or voiding manufacturer warranties.
- No chemicals: Our pure water system is completely chemical-free, making it safe for your panels and the environment.
- Ground level operation: Our long-reach pole systems mean we can clean most domestic solar panel installations without ladders or roof access.
How Often Should Solar Panels Be Cleaned in Buckinghamshire?
We recommend solar panel cleaning at least once or twice a year for most Buckinghamshire properties. If you have trees nearby, or if bird activity is high in your area, you may benefit from more frequent cleaning. A spring clean to remove winter grime and a late summer clean before the shorter days of autumn are typically the most beneficial times.
The Return on Investment
With the average UK solar panel system generating around 3,000–4,000 kWh per year, even a 15% efficiency loss represents a significant reduction in the energy you’re generating and the savings you’re making. Professional solar panel cleaning typically costs a fraction of this lost value — making it one of the best-value maintenance tasks you can do for your home.
Book Solar Panel Cleaning in Buckinghamshire
MPF Exterior Cleaning provides professional solar panel cleaning throughout Buckinghamshire, covering High Wycombe, Amersham, Beaconsfield, Marlow, Chesham, Princes Risborough, and surrounding areas. Call us on 07871 097020 or use our contact form for a free quote.