Careful removal of dust, pollen and droppings so panels return to their full generating efficiency.
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Understanding how to safely maintain your solar array ensures maximum photovoltaic efficiency, protects your manufacturer warranty, and optimizes your renewable energy investment. Below are detailed answers to the most common questions we receive regarding our professional solar panel cleaning services.
While rain can wash away light dust, it is incapable of removing stubborn, baked-on contaminants such as sticky bird droppings, tree sap, lichen spots, traffic film, and heavy pollen. In fact, rain often worsens panel efficiency because water droplets collect airborne dust and soot, drying into calcified water spots that cast shadows across the photovoltaic cells. Relying solely on rainfall can leave your panels operating well below their peak capability.
Yes, severe grime build-up directly impacts solar generation. Solar photovoltaic (PV) cells require direct, unhindered sunlight to convert photons into electrical current. When a layer of grime, lichen, or bird droppings covers even a small portion of a panel, it creates a “shading effect.” Because solar modules are wired in strings, shading on a single cell can restrict energy flow across the entire string, resulting in efficiency drops ranging from 10% to over 25% depending on panel condition.
Tap water contains dissolved minerals like calcium, magnesium, and sodium. Washing solar glass with tap water or standard detergents leaves behind a thin, calcified film or sticky chemical residue that attracts fresh dust even faster and blocks sunlight. We utilize a multi-stage water purification system that removes all dissolved solids (0 PPM purity). Pure water acts as a natural solvent that dissolves grime safely and dries naturally without leaving streaks, spots, or residue behind.
Yes, using high-pressure jet washers, harsh chemicals, or abrasive sponges can cause irreversible damage to your solar investment. High water pressure can break the watertight silicone seals around panel frames, drive moisture into the internal wiring junction boxes, or micro-crack the delicate tempered glass. Chemical detergents can strip away the specialized anti-reflective coating applied to solar glass. At GES, we use low-pressure pure water systems and non-abrasive, soft-bristled brushes specifically approved for solar panel care.
For optimal energy generation, residential solar panels in Surrey should be professionally cleaned at least once or twice a year. Annual cleaning in late spring or early autumn is ideal for removing winter soot, spring pollen, and heavy bird droppings. Panels located near busy roads, agricultural land, coastal areas, or underneath heavy tree canopies benefit from bi-annual maintenance to prevent rapid grime build-up.
We utilize ultra-lightweight carbon fiber water-fed telescopic poles that allow our technicians to safely clean rooftop solar arrays directly from ground level or stable access platforms. This reach-and-wash technology extends up to four storeys high, eliminating the need to walk on fragile roof tiles, step near panel arrays, or install costly temporary scaffolding for standard residential cleans.
Yes, our cleaning methodology strictly adheres to guidelines set out by leading solar panel manufacturers (such as SunPower, LG, Canadian Solar, and REA Solar). Manufacturers explicitly stipulate that panels must be cleaned using non-abrasive soft brushes, low-pressure pure water, and zero harsh chemical detergents. Cleaning your panels with our approved system preserves your long-term product and performance warranties.
In most cases, residential solar systems do not need to be manually shut down during a standard exterior glass clean, as we only interact with the top glass surface and non-conductive frames using pure water. However, if required by your specific inverter setup or commercial safety regulations, our team can guide you through a quick isolation procedure before we begin.
Yes, we provide comprehensive cleaning services for ground-mounted solar installations, residential rooftop arrays, agricultural solar arrays, and large commercial PV systems. Ground-mounted systems often accumulate higher levels of splash-back mud, dust, and vegetation residue, making regular pure-water maintenance even more critical for performance.
Pricing depends on the overall number of solar panels, array accessibility (e.g., ground-mounted vs. two-storey roof vs. commercial flat roof), and current surface condition. Because routine panel cleaning restores lost energy generation, the service frequently pays for itself through increased electricity output. We offer transparent, fixed-price quotes with zero hidden fees.
Investing in solar technology is one of the most effective ways to lower household energy bills and reduce your carbon footprint, but solar panels require clear glass surfaces to operate at maximum capability. Over time, airborne pollution, bird droppings, tree sap, and atmospheric soot form an opaque barrier over photovoltaic cells, reducing your system’s overall energy yield. At GES Exterior Cleaning, we use specialized 100% pure deionised water systems combined with soft-bristled telescopic brushes to safely restore light transmittance across your panels without risking glass scratching, seal degradation, or warranty cancellation.
Maintaining your solar array requires specialized soft-washing equipment, purified water technology, and trained technicians who understand how to care for delicate electrical glass installations. Professional solar maintenance preserves your equipment while maximizing your return on energy investment.
Layered grime, bird droppings, and microscopic pollution prevent sunlight from penetrating into the silicon photovoltaic cells beneath the glass. Professional pure-water cleaning restores complete light absorption, immediately boosting daily kilowatt-hour (kWh) generation and lowering your grid electricity purchases.
Attempting to clean panels with household glass cleaners, abrasive sponges, or high-pressure washers can strip anti-reflective coatings or shatter glass seals, completely voiding manufacturer warranties. Our pure-water, soft-brush methodology aligns perfectly with major solar manufacturer maintenance guidelines.
Opaque debris like baked-on bird droppings creates severe localized shading. Photovoltaic cells located beneath dark spots cannot generate current; instead, they absorb energy from surrounding cells and overheat, forming localized "hotspots" that can permanently damage the panel module and shorten system lifespan.
Washing solar panels with tap water or soapy detergents leaves behind a thin, calcified film or sticky residue that blocks sunlight and attracts dust rapidly. Our 100% pure deionised water dissolves dirt naturally and dries completely spot-free, keeping panels cleaner for much longer.
Walking on roof tiles to reach solar arrays carries immense risks of broken tiles, fell hazards, and physical damage to panel frames. Our ultra-lightweight carbon fiber water-fed poles allow us to clean rooftop arrays safely and effectively from ground level.
Solar panels are a major financial investment designed to yield financial savings for 25+ years. Leaving arrays neglected allows grime to compound, lowering overall system efficiency year after year. Regular maintenance ensures your system operates at peak financial return throughout its lifespan.
Drag each slider to compare the surface before treatment with the finished result on homes and businesses across Surrey.
Watch how the GES team restores render, patios, roofs and driveways on properties in Epsom, Banstead, Surbiton, Esher and across Surrey and the South East.
Careful preparation and the right method for the surface, every time.
Commercial equipment and treatments that deliver visible improvement.
Edges, joints and finishing touches that reflect the GES standard.
From Epsom and Ewell to Cheam, Banstead and Kingston upon Thames, GES has built its reputation one property at a time — through careful workmanship, clear communication and results customers are happy to recommend.
Based in Stoneleigh near Epsom, we provide exterior cleaning throughout Surrey — including Sutton, Cheam, Kingston, Leatherhead, Reigate and Guildford — as well as South West London and the wider South East. If your property is nearby but not listed, get in touch — we’ll happily confirm whether we cover you.
Speak to Mike and the GES team to arrange your free site survey anywhere in Surrey — from Epsom and Stoneleigh to Wimbledon and Guildford. We’ll recommend the right approach for your surfaces and provide a clear, no-obligation quote.
Free site survey. Clear pricing. No obligation.
No obligation. We only use your details to prepare your quote.
