We use cookies for essential site functions and, with your consent, analytics and advertising. Cookie Policy AcceptReject Home About Services▾Roof CleaningPressure WashingGutter CleaningDriveway CleaningPatio CleaningDecking CleaningFence CleaningSoftwashingSolar Panel Cleaning Areas We Cover Reviews Specials Blog Contact 0800 654 6701Get Free Estimate - Home - Blog - Solar Panel Cleaning: Boost Efficiency by 30%Solar Panels # Solar Panel Cleaning: Boost Efficiency by 30% 18 November 20245 min read Solar panels are a significant investment — typically £5,000–£10,000 for a domestic system. Yet many homeowners in London and Surrey neglect one simple step that could dramatically improve their return: keeping them clean. ## How Much Efficiency Do Dirty Panels Lose? Research consistently shows that dirty solar panels lose between 15% and 30% of their energy output. In the UK, where we don't have the luxury of abundant sunshine to begin with, every percentage point matters. The main culprits are bird droppings, tree pollen, dust, lichen and general atmospheric pollution. In urban areas like London, pollution films build up faster than in rural locations. ## Does Rain Clean Solar Panels? This is the most common misconception. Rain does rinse off some loose dust, but it doesn't remove: - Bird droppings (which are acidic and bond to glass) - Lichen and algae growth - Pollen and tree sap - Hard water deposits and mineral buildupIn fact, rain can make things worse by creating dirty water streaks as it dries, further reducing light transmission through the glass. ## How Often Should You Clean Solar Panels? For most domestic installations in the South East, we recommend professional cleaning once or twice a year. Properties with heavy tree coverage or near flight paths (common across Sutton and Morden) may benefit from more frequent cleaning. The best times to clean are in spring (after winter grime and before peak solar generation) and in autumn (after pollen season and leaf fall). ## Why Not DIY? We understand the temptation, but there are good reasons to use professionals: - Safety — Solar panels are on your roof. Falls from height are the most common cause of DIY fatalities in the UK - Warranty — Many solar panel warranties require professional cleaning. Using household chemicals or abrasive materials can void your warranty - Effectiveness — We use purified deionised water and specialist equipment that leaves no residue. Tap water leaves mineral deposits that actually reduce efficiency - Inspection — During cleaning, we inspect panels for damage, loose fixings, cable issues and other problems that affect performance ## Our Solar Panel Cleaning Process We use a telescopic pole system with purified water — no chemicals, no pressure, no risk to your panels. The purified water dries spot-free without leaving mineral deposits. The entire process typically takes 30–60 minutes for a standard domestic installation. ## The Financial Case for Clean Panels A typical 4kW domestic system generates around £800–£1,000 per year in energy savings and export payments. If dirty panels reduce that by 25%, you're losing £200–£250 per year. Professional cleaning costs £80–£150 per visit — the payback is immediate. ## Book Your Solar Panel Clean Maximise your solar investment with professional cleaning. We serve all of London and Surrey. Get your free quote or call 0800 654 6701. ## More Articles ### How Often Should You Clean Your Roof? UK Guide Most homeowners don't think about roof cleaning until moss is visible from the street. Learn the recommended cleaning schedule and warning signs to watch for. ### Pressure Washing vs Softwashing: Which Is Right? High pressure isn't always the answer. Discover when to use pressure washing and when softwashing is the safer, more effective choice for your surfaces. ### Moss Damage to Roof Tiles: What to Know Moss isn't just unsightly — it actively damages your roof. Learn how moss lifts tiles, traps moisture and leads to costly repairs if left untreated. ## Need Professional Help? Our team is ready to help with any exterior cleaning project. Free quotes, no obligation. Get Free Estimate0800 654 6701 Family-run roof cleaning and pressure washing specialists serving London & Surrey. Over 20 years protecting your property. ### Services - Roof Cleaning - Pressure Washing - Gutter Cleaning - Driveway Cleaning - Patio Cleaning - Softwashing - Decking Cleaning - Fence Cleaning - Solar Panel Cleaning ### Areas We Cover - London - Surrey - Worcester Park - Sutton - New Malden - Morden - Chessington - Coulsdon ### Contact 0800 654 6701 07551 442228 mossmenlondon@gmail.com55 Wolsey Close, Worcester Park, Surrey, KT4 7EF Opening Hours:24 Hrs Line Open, Monday – Sunday Our WorkBlogSpecials & OffersCustomer Reviews © 2026 Moss Men Roof Cleaning London. All rights reserved. Privacy PolicyTerms & ConditionsCookie Policy Call NowFree Estimate