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Professional Solar Panel Cleaning in Bristol

Keep your panels producing at their best. Dirt, pollen, bird droppings and moss can reduce output — professional cleaning restores performance safely and protects warranties.

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Why Clean Solar Panels Matter (Key Statistics)

Dirty panels can cost you real power and money. Research shows soiling can reduce energy output by a few percent up to 30–40% in extreme cases; typical realistic losses are commonly reported in the 5–15% range depending on location and pollution levels.

One paper estimated annual revenue loss due to dust accumulation can be up to 35% when solar radiation is reduced substantially — demonstrating that regular cleaning is an economic decision for many homeowners.

Energy Efficiency

reduce energy output in extreme cases

Revenue Loss

when solar radiation is reduced

Energy Efficiency

common reduce energy output

How Much Extra Energy Can You Expect? (Realistic Gains)

Light Soiling

loss – cleaning can recover most of this

Heavy soiling (coastal, agricultural dust, long neglect)

possible gains after deep cleans

Moderate Soiling (urban/leafy areas)

potential; uplift after cleaning

For many Bristol roofs—especially near trees or roads—annual cleaning often pays for itself in recovered generation over a few years.

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Frequency: How Often Should Panels Be Cleaned?

General guidance (adjust by local conditions):

Clean every 12–24 months for most suburban homes.
Clean twice a year for tree-lined or pollen-prone areas (like many parts of Bristol).
Clean quarterly in very dusty/coastal/agricultural zones.

Don’t neglect your solar panels!!!

Pro tip: Monitor system output (inverter data). A persistent unexplained dip in generation is a strong sign a clean is due.

Professional Solar Panels Cleaner’s Safe and Effective Methods

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Assessment & Safety First

Professionals inspect array orientation, roof access, microinverters, module condition and any shading issues before cleaning. Safety (PPE, harnesses, roof stability) is mandatory.

Water-Fed Pole with Deionized / Pure Water

Most pros use telescopic water-fed poles that deliver deionized (pure) water through soft-bristled brushes. Pure water leaves no mineral residue or streaks and avoids chemicals. This is the industry standard for safe rooftop cleaning.

Timing & Technique

Clean on cool, cloudy days, early morning or late evening to avoid thermal shock. Never spray cold water onto very hot modules.

Use soft brushes, low flow and pure water; rinse and record pre/post inspections.

An image of a house in Bristol with solar panel

FAQs (All About Solar Panel Cleaning)

No—if cleaning is non-abrasive and follows manufacturer guidance. Always use professionals who document methods and avoid pressure-washing. (Keep records.)

You can, but risks include ladder falls, panel damage, and streaks. Professionals use pure water systems and safe roof access. For high arrays or hard-to-reach roofs, leave it to pros.

When applied by trained technicians and recommended for moss/lichen control, targeted biocides can delay regrowth. Avoid indiscriminate chemicals; pros use approved products.

Early morning or evening on cool, cloudy days to prevent thermal stress and streaking. Avoid cleaning during heatwaves.

We serve Bristol, Bath and South Gloucestershire:

Almondsbury, BS32 – Alveston, BS35 – Avonmouth, BS11 – Aust, BS35 – Awkley, BS35 – Aztec West, BS32 – Bradley Stoke, BS32, BS34 – Charlton Hayes, BS34 – Clifton, BS8 – Coalpit Heath, BS36 – Cribbs Causeway, BS10, BS34 – Downend, BS16 – Easter Compton, BS35 – Emersons Green, BS16 – Filton, BS7, BS34 –Frampton Cotterell, BS36 – Frenchay, BS16 – Harry Stoke, BS34 –Hemleaze, BS9 – Highbrook View, BS36 – Highbrook Park, BS16 – Hortham Village, BS32 – Keynsham – Kingswood, BS15 – Little Stoke, BS34 – Lower Morton and Upper Morton, BS35 – Lyde Green, BS16 – Olveston, BS35 – Patchway, BS34 – Scholars Chase, BS16 –Stoke Bishop, BS9 – Tockington, BS32 – Tytherington, GL12 –Westbury-on-Trym, BS9 – Winterbourne, BS36