Solar panel cleaning: when it pays off and how to do it safely

For managers of roofs with solar panels, from an office building to a large industrial roof, who want to know whether cleaning is worth it. The honest answer depends on the roof. A European study (DLR, 2024) puts the average annual loss from soiling at 0.9% if rain cleans the panels perfectly, and up to 5.3% if rain does only a tenth of that work. These articles help you judge how that plays out on your roof: how often cleaning makes sense, which water to use, and how it can be done without anyone on the roof.

Articles on this topic

Aerial photo of a deep canyon with a winding river between steep rock walls covered in green moss, set in rolling green countryside

How often should solar panels be cleaned?

There is no fixed interval for cleaning solar panels. We explain how tilt, surroundings, season and panel type play a part, and how to decide using your own data.

27 September 2026 · 5 min read

Aerial view of a dried-out river delta whose branching channels form the shape of a tree in pale pink silt, with orange sand at the top of the frame

Is solar panel cleaning worth it in a rainy climate like Belgium?

Dirty solar panels do lose output, but in a rainy climate usually less than is often claimed. What the studies say, where cleaning pays off and how to check your own installation.

27 September 2026 · 5 min read

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Solar panel cleaning
When cleaning makes sense for your roof, and how we do it without anyone on the roof.
Solar panel cleaning

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