Your Sydney panels are leaking kWh. We get them back.

Yes, dust, pollen, bird droppings and grime block sunlight reaching the cells, and clean panels generally perform closer to their rated efficiency than dirty ones, particularly after Sydney's pollen-heavy spring or dusty, dry spells. The performance gain varies by how dirty the panels were beforehand and location, but many homeowners notice a difference on their generation figures after a clean. Panels near busy roads or under trees tend to get dirty faster.

Most Sydney homes benefit from solar panel cleaning once or twice a year, though homes near busy roads, under trees, or close to bushland with dust and pollen may need more frequent cleaning to maintain output. Coastal homes can also see salt film buildup that's worth checking on. Your inverter app or monitoring system is a good way to notice if output has been gradually dropping.

Climbing onto a roof to clean solar panels carries real fall risk, and using the wrong equipment or harsh chemicals can scratch panel coatings or void manufacturer warranties. Professional cleaners use soft brushes and purified water systems designed specifically for solar glass, and carry insurance for roof work. For most homeowners, it's safer and more cost-effective to have it done professionally.

Cleaning itself generally won't void a warranty, but using abrasive tools, high pressure or harsh chemicals not approved by the manufacturer can cause damage that isn't covered. Reputable Sydney solar cleaners use manufacturer-appropriate soft brushes and purified water systems specifically to avoid this risk. It's reasonable to ask your cleaner what method and products they use before booking.

Yes, as a safety precaution most professional cleaners will isolate the solar system before cleaning panels directly, reducing any electrical risk while working with water near the panels. This is standard practice and shouldn't take long to switch back on afterward. Always check your cleaner is comfortable and experienced working around live solar systems.

A build-up of bird droppings, dust or pollen sitting on part of a panel can create shading that disproportionately affects output from that section of your solar array, more than the dirt's coverage area might suggest. This is a common issue for Sydney homes near trees or with local bird activity. Regular cleaning helps prevent hotspot issues developing on shaded cells over time.