Solar Panel Cleaning in Roseneath, Dunedin – Combating Pollen and Lichen for Maximum Efficiency

This week, our team at Eco Solar Clean was called to a beautiful property in Roseneath, Dunedin, overlooking the harbour. The view was incredible, but the solar panels were losing efficiency due to a heavy coating of pollen and the early stages of lichen growth.

Using the extendable, water fed pole to reach the panels safely

While the panels looked only lightly soiled to the eye, the owners had already noticed a dip in performance. After a full clean with our purified water system, the panels were restored to peak condition, ready to capture every ray of Dunedin sunshine.

The panels before they are cleaned, lots of pollen sitting on them, even after it had rained the day before

Why pollen is a problem for solar panels in Dunedin

Dunedin experiences long pollen seasons due to its mix of trees, pasture grasses, and coastal plants.

• Spring tree pollen: Cypress and birch release large amounts of pollen in spring.

• Grass pollen: Runs from August through March, with peak levels in late spring and summer.

• Pine pollen: Drops in a heavy yellow cloud for a few weeks each year.

This combination means solar panels in Dunedin can be affected by pollen for more than half the year. Pollen dust settles across the glass surface, forming a fine film that reduces sunlight absorption and lowers electricity generation. Unlike dust, pollen is waxy and sticky—rain alone is not enough to wash it away.

The panels after they had been cleaned

The Added Challenge of Lichen

Alongside pollen, lichen is a common issue for Dunedin solar panels. Growing in our damp, coastal climate, lichen attaches firmly to the glass surface. If left untreated, it not only reduces efficiency but can also cause long-term staining and damage.

At Roseneath, we noticed early signs of lichen. Because it was caught in time, our professional cleaning safely removed it without harming the panels.

We make sure we get all along the edges and corners, this is where the lichen likes to grow

Benefits of Professional Solar Panel Cleaning

Boosted efficiency – Most panels loose 10–15% output when dirty.

Protection from damage – Gentle brushes and purified water avoid scratches or residue.

Extended lifespan – Removing lichen, moss, and salt helps protect panel surfaces.

Peace of mind – Regular maintenance ensures your solar system works at its best.

The side by side comparison, pictures paint a thousand words!

How Often Should You Clean Panels in Dunedin?

With long pollen seasons and coastal conditions, we recommend:

• At least once per year for most homes.

• Twice per year for properties close to trees, farms, or the harbour (like Roseneath).

Monitoring your solar output is also a great way to spot when cleaning may be due. If you see an unexplained dip in generation, especially in spring, it’s often pollen.

Before

After

Final Thoughts

Roseneath offers one of the best views in Dunedin, and solar panels there can generate plenty of clean energy. But pollen and lichen are constant challenges. By scheduling regular solar panel cleaning, homeowners can keep their panels performing at their best year-round.

At Eco Solar Clean, we’re here to help Dunedin homeowners maximise their solar investment, whether you’re in Roseneath, Mosgiel, Allanton, or beyond.

Contact us today to book your clean and keep your solar panels powering efficiently!