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Solar Panel Cleaning Perth: When to Call a Professional and What a Visit Includes
The bill comes in lower than the one before, and nobody’s changed a thing. Same house, same panels, same habits. Then you look up at the roof. A grey film across the glass, a bird’s work in one corner, leaves stuck against the frame.
Solar panel cleaning Perth homeowners can book is a roof service that removes dust, droppings and grime from panels so more sunlight reaches the cells. Most households only need it once or twice a year. The real question is when your panels have crossed that line, and who should be up there.
If you already know you want help, our solar panel cleaning Perth page explains how the service works. And if you’d rather clean them yourself, our post on the best way to clean solar panels covers the DIY steps. This one is about the other decision: hiring.
What is solar panel cleaning?
Quick definitions first. Solar panel cleaning refers to washing the glass surface of a panel and checking the frame and mounts, so dirt stops blocking light. Soiling is the layer of dust, pollen, bird droppings and grime that builds up on that glass. A string inverter system is one where panels are wired together, so a heavily shaded panel can drag the whole string down. A micro inverter system gives each panel its own inverter.
That last one matters. According to Energy Matters (2024), bird droppings can hurt output more than dust does. On a string system, droppings covering one panel can cause very low or no output. On a micro inverter system, the affected panel may produce little or nothing.
How much does dirt really cost you?
It varies. According to Energy Matters (2024), the studies it cites put the loss from dust at 5% or less in many cases. But it also says uncleaned panels can lose up to 30% of their efficiency, and up to 40% in very dusty settings. Don’t trust a cleaner who quotes one tidy number.
Dirt isn’t the only suspect, either. A faulty inverter, new shade from a tree and normal ageing can all lower output. So check your monitoring app first. If production has slid and the panels look filthy, cleaning is a fair first step.
Rain helps, but not always. Red Energy (2024) says panels are often self cleaning in the rain, though not every time. Droppings, sap and dried on mud tend to stay put.
How often should you clean?
Red Energy (2024) says once or twice a year is adequate in most environments. Energy Matters (2024) suggests at least twice a year in Australia, typically spring and autumn. Our own advice is every 6 to 12 months for most Perth homes.
Some roofs need more. Here’s what pushes the schedule forward:
| Situation | Why it matters |
| Near a busy road or building site | Dust and grime settle faster |
| Close to the coast | Salt and fine grit stick to the glass |
| Large trees nearby | Leaves, sap and roosting birds |
| After a big storm | Debris and mud on the panels |
| After a long dry spell | Dust builds up with little rain to wash it off |
| Visible droppings | Concentrated shading on single panels |
What does a professional visit include?
It should be more than a quick rinse. Our service starts with an inspection and a safety check of the roof and the system. Then loose debris comes off, and the panels are cleaned gently with purified water and soft bristle equipment. We don’t use high pressure. After that we look over the frame and mounting, and finish with a performance check and a site clean up.
Why purified water? Tap water can leave mineral spots, and Energy Matters (2024) recommends deionised or distilled water for that reason. Pressure washers are the bigger worry. The same article says the force can damage panels.
Then there’s the roof itself. Panels sit up high on slippery surfaces. Red Energy (2024) says solar power is “every bit as dangerous as conventional electricity” and recommends a Clean Energy Council accredited technician for maintenance, not DIY. For repairs or electrical faults, you want a qualified solar electrician. A cleaner’s job is cleaning and a visual check.
Questions to ask before you book
Not every cleaner works the same way. Ask:
- Do you use purified water, and no pressure washer?
- Who goes on the roof, and are they insured?
- Do you inspect the frame and mounts?
- Will you check my panels against the manufacturer’s care guide?
- What happens if you spot a crack or a loose cable?
- Is the quote in writing, with the scope listed?
A decent crew answers all six. If they dodge the roof one, move on.
Check your warranty first
Some manufacturers set cleaning rules. Energy Matters (2024) advises following the manufacturer’s care guidelines to avoid voiding warranties, and Red Energy (2024) warns that skipping required maintenance might void cover. Dig out your panel paperwork, or ask your installer, before anyone touches the glass.
Gutters and panels go together
Panels and gutters share a roof, and trouble in one often shows up in the other. Leaves caught in a blocked gutter can slip onto the array, and nearby trees drop debris on both. Energy Matters (2024) even suggests regular gutter cleaning for panels near trees.
So if you’re booking one, it can make sense to look at the other. Our gutter cleaning in Perth and roof gutter cleaning pages explain what’s involved. See our gallery for past work.
The mistake that costs twice
Cleaning the panels and ignoring what made them dirty. A tree dropping leaves, a gutter overflowing onto the glass, a bird roosting right above the array. You’ll pay for the same clean again in three months.
My view: fix the source if you can. Trim the branch, clear the gutter, and then book the clean. It’s cheaper than treating the symptom every season.
FAQ
How often should I get solar panel cleaning in Perth?
Most Perth homes need it every 6 to 12 months, based on our advice. According to Energy Matters (2024), at least twice a year is generally recommended in Australia, with more for dusty, coastal or low rainfall spots.
Does rain clean solar panels?
Partly. Rain can wash away loose dust, but according to Red Energy (2024) it isn’t always enough. Droppings, sap and mud often stay behind.
Can dirty solar panels reduce power output?
Yes. According to Energy Matters (2024), uncleaned panels can lose up to 30% of efficiency, and bird droppings can have an outsized effect. Faults and shade can lower output too, so check both.
Is it safe to clean solar panels myself?
It can be risky. Panels sit on roofs, surfaces get slippery and the glass is fragile. Red Energy (2024) recommends an accredited technician instead of DIY cleaning.
Do you use a pressure washer?
No. We use purified water and soft bristle, non abrasive equipment, as our service page explains.
How do I get a quote?
Use the quote page, call 0421 779 199, or email perthgutterscleaning@gmail.com. The quote is free.
Want your panels checked? Contact Perth Gutters Cleaning at 2/454 Scarborough Beach Road, Osborne Park WA 6017, or visit the home page to see all our services.
