Rain washes off most everyday dust, so many panels in the UK need little cleaning. But some homes lose a noticeable amount of power to dirt.
When cleaning is worth it
- Panels are fairly flat, so dirt sits on them rather than washing off.
- You live near farmland, a busy road or the coast.
- Birds roost on the roof, or moss and lichen are growing.
- Your app shows output falling compared with the same month last year.
How panels should be cleaned
- Pure water with a soft brush, usually from the ground with a water-fed pole.
- No pressure washers or harsh chemicals: they can damage the coating and your warranty.
- Early morning or evening, as cold water on hot glass isn't ideal.
How often
Once a year is plenty for most homes. Some people book it alongside a window clean to save on the call-out.
Tip: If birds are nesting under the panels, ask about bird-proofing mesh at the same visit.