Plenty of Far North Queensland homes have solar on the roof — it makes sense when you've got this much sun. But panels only pay their way if they're actually catching that sun, and up here they get dirty faster than just about anywhere in the country. The catch is you rarely notice, because the loss creeps up slowly on your power bill rather than showing up as a fault.
Why panels get filthy so fast up here
It's the tropics doing what the tropics do. Salt carries in off the coast, red dust settles through the dry, and cane ash drifts across during the burn. Then the humidity goes to work — the same mould, algae and lichen that green up your roof and walls take hold around the panel frames and edges. Add bird droppings and leaf litter off any overhanging trees and you've got a film that quietly blocks the light.
Doesn't the rain clean them?
That's the myth, and it's an easy one to believe when it buckets down for months. But rain doesn't rinse panels clean — it runs the dirt into streaks, leaves mineral and salt residue behind as it dries, and pools grime along the bottom edge of each panel where the frame sits. Worse, all that moisture actually feeds the mould and algae rather than washing it away. And panels laid at a low pitch — which most FNQ roofs have — shed almost nothing on their own.
How much output are you losing?
It depends how dirty they are, but a decent layer of grime, mould and bird mess can knock a noticeable chunk off what your system produces — enough to see it on the bill across a year. Because it happens gradually, most people never connect a creeping power bill to panels that simply need a wash. Clean panels just catch more of the light you paid good money to capture.
Why you shouldn't blast them yourself
Two problems. First, climbing onto a roof — often a wet, slippery one up here — is exactly the sort of job that lands people in hospital, and it's not worth it. Second, a pressure washer is the wrong tool: high pressure can craze the glass coating, force water past the seals, and in some cases void your panel warranty. It's the same reason we soft wash roofs instead of blasting them — the gentle method is the one that actually protects the surface.
How we clean solar panels
We use a soft wash approach with purified water and gentle brushing — enough to lift salt, mould and bird mess without touching the glass or the seals. Where we can, we work from the ground with a water-fed pole, which keeps the job safe and keeps foot traffic off your roof. No harsh chemicals left sitting on the panels, and no high pressure near the seals.
How often should you do it?
For most FNQ homes, once a year keeps panels performing. If you're close to the coast, near cane, or under trees, every six months is the safer bet. An easy way to catch it early: if your inverter app shows this dry season's output creeping below what you got last year over the same sunny stretch, a wash is usually overdue. The dry season is the time to book it in — everything's accessible, and the panels stay clean longer before the wet sets back in.
Get a free quote
We're mobile right across the Cairns to Tully corridor, and panels are an easy add-on while we're already cleaning your roof or house. Not sure on cost? Have a look at our 2026 pressure washing price guide or the areas we cover. Request a free quote or call 0481 787 960.