Do certain types of solar panels require different cleaning methods?

Generally, most solar panels in the UK can be cleaned using similar methods, but factors like panel positioning, soiling severity, and installation type influence the best approach. Below is a guide to methods, practical advice, and common considerations.

Cleaning Methods by Installation Type

Roof-Mounted Panels

• Challenges: Access difficulty and safety risks.
• Solutions:
• Use extension poles, soft brushes, and cloth-covered sponges for DIY cleaning.
• Professional services with water-fed poles using purified water to prevent mineral streaks.
• Do not use pressure washers as they can damage seals or glass surfaces.

Ground-Mounted or Shed-Based Panels

• Advantages: Easier access for manual cleaning.
• Method:
• Use mild detergent (e.g., dish soap) and non-abrasive materials (microfiber cloths, not coarse sponges).
• Rinse with lukewarm water to avoid thermal shock in cold weather.

How Soiling Affects Cleaning

• Light dirt: Hose down with plain water (effective for rain-assisted UK climates).
• Stubborn grime (e.g., bird droppings, tree sap):
• Manual scrubbing with biodegradable soap.
• Rotating brushes for commercial-scale installations.
• Snow: Gently remove using a soft-bristle pole once it loosens naturally.

Recent UK Trends & Considerations

• More automated systems are being used for large commercial arrays, with rotating brushes and purified water jets.
• Robotic cleaners are increasingly used for complex installations (e.g., tilted panels or solar farms).
• Insurance: Verify that professional cleaners carry liability coverage, especially for roof work.

Common Mistakes to Avoid

1. Harsh chemicals: Avoid vinegar or ammonia-based cleaners, as they degrade anti-reflective coatings.
2. Abrasive tools: Steel wool or stiff brushes scratch surfaces, reducing efficiency.
3. Timing: Clean early morning or dusk to prevent rapid drying streaks.

Practical Advice

• Frequency: Clean 1-2 times yearly unless near farms (bird activity) or construction sites (dust).
• Cost: Professional services typically cost £100–£300 for residential systems.
• DIY Safety: Wear gloves, non-slip footwear, and ensure ladders are secured.

For small business owners, automated systems can save money over time for installations over 50 kWp, while homeowners benefit from scheduled professional cleaning to maintain warranty requirements.