How to Clean Solar Panels: A Sydney Homeowner’s DIY Guide (Safety First!) – 2025
Keeping your solar panels clean is essential for maximising their energy output and ensuring you get the best return on your investment in Sydney. While professional cleaning by experts like Edgeflow is always the safest and most effective option (and highly recommended – see our Sydney solar panel cleaning service), some homeowners may consider a DIY approach. If you’re determined to clean your solar panels yourself, this guide provides essential steps and critical safety precautions.
IMPORTANT DISCLAIMER: Cleaning solar panels, especially on a roof, involves significant risks, including falls, electric shock, and panel damage. Edgeflow strongly advises homeowners to use professional services. This guide is for informational purposes only. If you are unsure or uncomfortable at any point, DO NOT PROCEED. Prioritise your safety above all else.
Why Bother Cleaning Solar Panels?
Before you start, understand why solar panels require cleaning. Dirt, dust, bird droppings, pollen, and salt spray (common in coastal Sydney) can significantly reduce their efficiency. Regular cleaning helps maintain optimal performance.
When is the Best Time to Clean Solar Panels?
- Early Morning or Late Afternoon: Clean panels when they are cool. Hot panels can cause water to evaporate too quickly, leaving streaks or even potentially causing thermal shock (though rare with modern panels). An overcast day is also ideal.
- Frequency: This depends on your Sydney location and environment. Check our guide on how often solar panels should be cleaned.
Essential Safety Precautions for DIY Solar Panel Cleaning:
THIS IS THE MOST IMPORTANT SECTION. DO NOT SKIP.
- NEVER work alone. Always have a spotter or helper.
- Assess Roof Safety: If your panels are on a steep or slippery roof, DO NOT attempt DIY cleaning. Professionals have specialised safety harnesses and equipment.
- Use a Sturdy Ladder: Ensure your ladder is on stable, level ground and extends sufficiently above the roofline. Follow all ladder safety guidelines.
- Wear Appropriate Gear:
- Non-slip, soft-soled shoes with good grip.
- Safety glasses to protect your eyes.
- Gloves (though be mindful they can reduce grip).
- Check Weather Conditions: Avoid cleaning on windy, rainy, or icy days.
- System Shutdown (Highly Recommended): Consult your solar system manual or installer about safely shutting down your system (disconnecting the DC isolator) before cleaning to minimise any electrical risk. If unsure, DO NOT proceed.
- Avoid Contact with Wiring: Be extremely cautious of any exposed wiring or electrical components.
- No High Pressure: Never use a high-pressure washer directly on panels, as it can damage seals or the panel surface.
What You’ll Need for DIY Solar Panel Cleaning:
- A soft brush with a long, non-metallic handle (specifically designed for solar panels or car washing).
- A regular garden hose with a spray nozzle (avoid high pressure).
- A bucket.
- Mild, biodegradable soap or a specialised solar panel cleaning solution (optional, often plain water is sufficient). Check panel manufacturer recommendations.
- A squeegee with a soft rubber blade (optional, for a streak-free finish).
- Clean, de-ionised or distilled water if your tap water is very hard (to prevent mineral spots).
Step-by-Step Guide to Cleaning Solar Panels (If Safe to Proceed):
- Prepare Your Equipment: Gather all your tools and ensure your ladder is safely positioned.
- Initial Rinse: Gently rinse the panels with the hose to remove loose dust and debris. Work from top to bottom.
- Wash (if needed): If rinsing isn’t enough, dip your soft brush in a bucket of clean water (or water with a tiny amount of mild soap, if using). Gently scrub the panel surface to loosen stubborn grime. Apply minimal pressure.
- Rinse Thoroughly: Immediately rinse off any soap residue with clean water, again working from top to bottom. Ensure no soap is left to dry on the panels.
- Squeegee (Optional): If using a squeegee, gently pull it from top to bottom in overlapping strokes to remove excess water and prevent spotting. Wipe the blade clean after each stroke.
- Allow to Air Dry: The panels will typically air dry quickly, especially if cleaned on a cool, overcast day or early/late in the day.
What NOT to Do When Cleaning Solar Panels:
- DON’T use abrasive cleaners, harsh chemicals, or rough scrubbing tools.
- DON’T use high-pressure washers directly on the panels.
- DON’T walk or lean heavily on the solar panels.
- DON’T clean hot panels in direct, strong sunlight.
- DON’T use hard tap water if it leaves mineral deposits; consider de-ionised water.
Why Professional Solar Panel Cleaning by Edgeflow is Often the Best Choice for Sydney Homes:
While DIY is possible for some, professional cleaning by Edgeflow offers significant advantages:
- Safety: Our team is trained in working at heights and uses appropriate safety equipment. We take the risk so you don’t have to.
- Effectiveness: We use specialised tools and purified water systems for a streak-free clean that maximises efficiency.
- Panel Protection: We know how to clean panels without risking damage or voiding warranties.
- Convenience: We save you time and effort.
- Inspection: We can often spot potential issues with your system during cleaning.
Conclusion: Clean Panels, Maximum Power – The Safe Way
Cleaning your solar panels is an important part of maintaining your Sydney solar investment. While this guide provides DIY steps, always prioritise your safety. If you have any doubts, or if your panels are difficult to access, the smartest choice is professional cleaning.
Edgeflow offers expert, safe, and reliable solar panel cleaning services across Sydney. As part of our broader exterior cleaning solutions, we are committed to helping you get the most from your home. Contact us today for a free quote and peace of mind.