Rain doesn't always clean panels. How often to clean them and the signs they need it.
Rain helps, but it rarely removes everything.
A visible film, bird droppings or a drop in output compared to last year.
Once or twice a year suits most homes. See regular solar maintenance.
Pigeons nesting under panels cause mess. See bird proofing.
Before you decide, keep in mind that panels need a much gentler approach than paths and driveways, and it's worth seeing how exterior cleaning services adjust for different surfaces.
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