How To Properly Clean Your Solar Panels (And Why It's Important)

Dirt can cut solar output, but cleaning only pays off when the numbers make sense.

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Solar panels are outside for the duration of their working life, so it's optimistic to think they will remain spotless. Dust, pollen, bird droppings and sometimes a layer of mystery grime will build up on the glass — and if enough of it accumulates, the amount of sunlight reaching the cells below does get affected.

Not all roofs that are a little dusty…