Solar Panel Cleaning: Does It Actually Improve Efficiency?

Solar panels work by absorbing sunlight, so anything sitting on the surface — dust, pollen, bird droppings, or salt film in coastal areas — blocks that light and reduces how much power your system produces.

Some people say “doesn’t rain rain clean them?”— it mostly rinses away loose dust and often leaves the stubborn stuff behind, like baked-on droppings, lichen, tree matter, and hard water stains which can create hot spots that drag down an entire section of your panels.

For most Brisbane homes, a clean once a year is enough to keep things running properly, with coastal properties benefiting from a six-monthly clean due to salt buildup. It's a small, low-cost step that protects the investment you've already made in your system — and it's far cheaper than losing output quietly for months without realising why your bills have crept up.

You’re looking at a 15 - 30% increase in energy production per clean. On average, you’ll see a return on your cleaning investment within 6–10 months, along with increased longevity for your solar system.