Solar Panel Cleaning Costs

How much does solar panel cleaning cost?

Professional solar panel cleaning costs £4-£8 per panel in the UK (2026). For a typical 10-panel system: £40-£80 per clean. For a 15-panel system: £60-£120. Most systems need cleaning once a year — sometimes less. Rain handles 80% of dirt. Professional cleaning uses deionised water and soft brushes (no chemicals). Cleaning improves output by 3-8% on average (more if panels are heavily soiled near trees, roads, or bird roosting areas). DIY cleaning: free but risky — never use pressure washers, abrasive cloths, or tap water (minerals leave residue). ROI of cleaning: £40-£80 spend recovers £50-£150 in extra generation.