Yes, warehouse solar panels need cleaning. UK conditions typically require cleaning 1-2 times per year. Frequency varies by site exposure: urban locations (more pollution and bird droppings) need more frequent cleaning; agricultural sites (dust accumulation) need annual or twice-annual cleaning; coastal sites (salt spray) need quarterly cleaning in some locations.
Why cleaning matters
Uncleaned panels lose 5-15% of output due to soiling. Annual cleaning typically restores 95%+ of clean-panel output. UK warehouse rooftops benefit from rainwater self-cleaning to some extent, but localised soiling (bird droppings, leaf debris, pollen) reduces output measurably.
Cleaning cost
Typical professional commercial solar panel cleaning: £1-3 per kW installed. For 1 MW system: £1,000-£3,000 annually. Specialist contractors use deionised water and telescopic poles to avoid damaging panels.
See more
O&M service detail: /warehouse-solar-maintenance/. Performance reporting: /warehouse-solar-monitoring/.