Panel glass has a coating that scratches more easily than ordinary glass. Detergents, scouring pads and pressure washers can damage it or force water into seals and junction boxes, which is why many panel makers advise against them.
Hard droppings and lichen are softened with water before they are lifted off, so the glass is not scraped. The frames and lower edges, where lichen and moss collect, are cleaned at the same time.
What the work covers
Dirt and film cleaned from the glass, which is then left to dry.
Lichen and moss worked off the bottom edge, where they collect.
Softened with water before they are lifted off the glass.
Rows of field and farm panels cleaned along their length.
Larger arrays cleaned on a schedule agreed with the site.
Questions people ask
What does solar panel cleaning cost?
The price depends on how many panels there are, where they are mounted, the height of the building and whether access equipment is needed.
Will cleaning affect my panel warranty?
Some manufacturers set conditions for cleaning, such as no detergent or no pressure washing. Check your warranty document and send us any specific instructions with your enquiry.
Will I see a difference in output after cleaning?
It depends how dirty the panels were. Heavily soiled panels may show a change on your monitoring, and lightly soiled ones may show little. Output also varies with the weather, so compare similar sunny days.
When is the best time of year to clean solar panels?
A clean in spring removes winter dirt before the longer days, when panels produce the most. A clean in late summer removes pollen and dust. Panels can be cleaned at other times in dry weather.