How are solar panels cleaned? Pure water cleaning and bird proofing explained
Updated 6 November 2026 · By the Solar Panel Cleaners team
Short answer: Professional solar panel cleaners use the reach-and-wash method: soft brushes on water-fed poles, supplied with purified water that has had its minerals removed. The panels are brushed and rinsed, and the pure water dries without spots, so no detergent is needed and most domestic panels can be cleaned from the ground. Pressure washers and abrasive tools are avoided because they can damage the glass coating and seals.
Reach-and-wash compared with other methods
| Method | Suitable for panels? | Why |
|---|---|---|
| Pure water and soft brush on water-fed pole | Yes | Gentle, spot-free and usually done from the ground |
| Hose and soft brush | Yes, for reachable panels | Fine for ground-mounted panels, but tap water can leave marks |
| Pressure washer | No | Can damage the anti-reflective coating and force water past seals |
| Detergents and strong chemicals | Usually no | Can leave a film and may breach manufacturer guidance |
| Scrapers and abrasive pads | No | Can scratch the glass permanently |
What purified water is
Tap water is passed through reverse osmosis and deionisation filters until almost all dissolved minerals are removed. Without those minerals there is nothing left behind when the water dries, so panels finish clear without being wiped. Pure water also attracts and lifts dirt, which is why detergent is not needed.
What bird proofing involves
- Clearing existing nests, droppings and debris from under the panels
- Cleaning the panels and, where needed, the surrounding roof and gutters
- Fitting a mesh skirt around the edge of the array
- Securing the mesh with clips that do not drill the panels or roof
Proofing is usually a one-off job that lasts for years, and it often costs less over time than repeated cleans on an array that pigeons keep fouling.
Related guides
- How much does solar panel cleaning cost in the UK? (2026 guide)
- Do solar panels need cleaning in the UK? What really affects output
- How to choose a solar panel cleaner: questions to ask and red flags
- DIY vs professional solar panel cleaning: what is safe to do yourself
- Pigeons under solar panels: signs, risks and how to stop them
- When is the best time to clean solar panels in the UK? Seasons, weather and what to expect
- Commercial and farm solar panel cleaning: a guide for businesses, schools and landowners
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