We operate one of the UK’s most popular designer shopping destinations, located in the heart of Kent, with over 90 premium and high-street brands attracting millions of visitors each year. Our retail environment is not just focused on aesthetics and customer experience, but also on sustainability and efficiency. A key part of our ongoing commitment to environmental responsibility includes our investment in renewable energy — specifically, a large solar panel installation across several of our roofing structures.
While the system was initially delivering as expected, over time we began to notice a gradual decline in the output performance of our solar array. It wasn’t immediate, but the drop-off became more significant as months went by. Despite favourable weather conditions and routine visual inspections, it became clear that the solar panels were no longer generating energy at their optimal levels. Something was obstructing their ability to function efficiently.
Upon closer examination, we identified that a substantial build-up of moss and organic debris had taken hold across large sections of our solar panel installations, particularly in shaded and less accessible roof areas. This wasn’t just surface grime; the moss had developed into thick patches that were actively preventing sunlight from reaching the photovoltaic cells.
This presented multiple concerns. Firstly, it was evident that the moss was not only affecting solar efficiency but also beginning to compromise the surface integrity of the panels and surrounding roof materials. Moisture retention from moss can lead to long-term degradation, while the added weight and organic material risked dislodging delicate fixtures or causing leaks. Secondly, it raised the issue of compliance and warranty protection. We understood that solar panel manufacturers often stipulate regular cleaning and maintenance as a condition of continued warranty coverage. Failing to act promptly could have invalidated our warranty agreements and left us financially exposed in the event of a system fault or failure.
Most importantly, there was the financial implication. Our solar system is a core part of our strategy to reduce grid reliance and lower operational costs. With performance dipping due to moss and debris, we were not seeing the returns we had projected. The lost opportunity in terms of energy production — and therefore cost savings — was significant, especially given the size and scope of our energy needs.
Recognising the urgency of the situation, we reached out to ACC Commercial Cleaning Ltd following a recommendation. From the initial contact, the team at ACC displayed a thorough understanding of both the technical and logistical challenges we were facing. We were immediately reassured by their experience with commercial sites and large-scale solar arrays. After a detailed site inspection and consultation, ACC developed a clear, phased plan tailored to our specific layout, operational hours, and safety requirements.
The promise was simple but comprehensive: to safely and effectively remove all moss, lichen, and accumulated debris from our solar panels and surrounding areas, using specialist equipment and environmentally safe cleaning methods. Crucially, the cleaning process would be carried out without using harsh chemicals or abrasive techniques, which could have caused damage or invalidated the system warranty. Access to the roof areas would be managed using IPAF-certified operatives and powered access platforms, allowing the work to be completed efficiently and in accordance with strict health and safety protocols.
The ACC team worked during off-peak hours to ensure there was no disruption to the daily flow of retail traffic or customer experience. Their professionalism throughout was impressive — the technicians were respectful of the premises, maintained tidy working areas, and worked closely with our facilities and maintenance teams to ensure seamless coordination.
The outcomes have been overwhelmingly positive. Post-cleaning performance data showed an immediate and measurable improvement in solar output, with many areas returning to full operational efficiency within days of the service. Our energy generation levels are now back in line with our original targets, helping to reduce overall energy costs and increasing our reliance on clean, renewable energy.
In addition to performance gains, we’ve also gained peace of mind. With all moss removed and surfaces restored, we’ve significantly reduced the risk of long-term damage to our infrastructure and avoided the potential cost of premature repairs or replacements. The cleaning also supports our warranty requirements, giving us continued coverage and confidence in the longevity of our system.
We’ve since agreed an ongoing maintenance schedule with ACC Commercial Cleaning Ltd to ensure that moss and debris never again reach the levels that caused disruption. Routine inspections and preventative cleans are now part of our facilities management plan, ensuring that our solar system remains an asset — not a liability.
From a broader perspective, this service aligns perfectly with our environmental values. Our visitors expect us to operate sustainably, and this project reinforces our commitment to energy efficiency, operational excellence, and long-term environmental stewardship.
ACC Commercial Cleaning Ltd exceeded our expectations in both service and results. Their attention to detail, industry knowledge, and ability to execute on a complex site made a real difference. We’re confident in our partnership and look forward to continuing to work with them to protect and enhance our solar investment in the years to come.
