Is Rain Enough to Clean Solar Panels – or Should You Pay for Professional Cleaning?
Is Rain Enough to Clean Solar Panels – or Should You Pay for Professional Cleaning? If you’ve invested in solar panels, you’ve probably asked this at some point—usually while staring out of the window during a downpour: “Surely this rain is doing the cleaning for me?” Short answer: sometimes… but not always. Longer answer: it depends on where you live, how your panels are mounted, and what’s landing on them. Let’s separate the myth from the data. ☔ What Rain Actually Does (and Doesn’t) Do Rainwater does help with: Light dust and airborne pollution Pollen in spring Salt spray (coastal areas) But rain does not reliably remove: Bird droppings (the worst offender) Sticky pollution films from traffic and industry Algae, lichen, and moss (very common in the UK) Dust baked on during dry spells Worse still, light rain can redistribute grime , creating streaks that block light more effectively than evenly spread dirt. 📉 How Much Efficiency Is Really L...