« Devis clair, sans surprise, primes comprises. Un seul interlocuteur du début à la fin. Je recommande sans hésiter pour le photovoltaïque. »
Pierre M.Tournai
Service · cleaning
Cleaning of solar panels
Over time, moss, lichen, pollen, dust and bird droppings form an opaque veil over your modules and eat into your output. We clean your panels with demineralised water, no abrasive product or detergent, to restore the yield safely.
up to +15% output yield restored
demineralised water no detergent or abrasive
safe work at height suitable equipment
Demineralised waterstreak-free rinsing
Surface preservedno scratching
What we clean
Everything that soils your modules, gently removed
A soiled module sends less light back to the cells: every opaque deposit is a loss of output. We deal with all the soiling that builds up on a Belgian roof.
Dust removal & pollen
In spring, pollen and dust form a thin but continuous film that veils the surface and dampens output across the whole array.
Moss & lichen
Along the frame edges and on the least exposed areas, moss and lichen take hold, retain moisture and create stubborn cast shadows.
Bird droppings
Opaque and acidic, droppings completely mask the cells concerned and can cause hot spots. We remove them without scraping the glass.
Pollution & soot
Near a main road or an urban area, soot and pollution particles cling to the glass and form a greasy film that reduces light transmission.
Frame & drainage
Cleaning around the frames and drainage points, where moss and debris accumulate and trap water against the module.
Post-cleaning visual check
Once clean, the array is visually inspected: glass, frames, fixings and exposed wiring, to flag any points of attention.
How it works
From output reading to clean glass
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Output assessment
We note your recent output and observe the degree of soiling of the modules to target the cleaning and measure the gain.
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Cleaning with demineralised water
Washing the modules with demineralised water using a soft brush and telescopic pole: no detergent, no abrasive product that could mark the glass.
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Streak-free rinsing
Demineralised water dries without leaving any mineral deposit: no limescale marks, a perfectly transparent surface once dry.
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Output check
We check the return of output via your monitoring and give you a clear summary of the array’s condition and the recommended frequency.
5 to 15% of output recoverable on soiled modules
Demineralised water no detergent or abrasive
1 to 2 yrs recommended cleaning frequency
100% technicians based in Belgium
Clean or soiled?
The output gap shows on the curve
At equal sunshine, a clean array produces noticeably more than one veiled by moss and pollen. A targeted cleaning recovers 5 to 15% of output on heavily soiled modules — often the equivalent of several months of savings.
- Clean modules: full light transmission, nominal output
- Soiled modules: opaque veil, cast shadows and hot spots
- Regular cleaning: yield maintained and lifespan preserved
Photo — before/after comparison of a cleaned solar panel
Are your panels veiled with moss or pollen?
Cleaning with demineralised water restores the yield without risking the glass. We schedule the work within a few days.
Frequently asked questions
Solar panel cleaning
How often should solar panels be cleaned?
In Belgium, cleaning every 1 to 2 years is enough in most cases. The frequency depends on the surroundings: being close to trees (pollen, leaves, droppings), a main road (soot), a livestock farm or a low roof tilt speeds up soiling and justifies a more frequent visit.
Isn’t rain enough to clean the panels?
Rain rinses off the lightest dust, but it removes neither ingrained moss and lichen, nor sticky pollen, nor droppings. Worse, at the bottom of the module rainwater laden with soiling dries into a stubborn deposit. Professional cleaning remains necessary to recover the full transparency of the glass.
Is there a risk of scratching the panels?
No. We wash with demineralised water using a soft brush and a telescopic pole, with no abrasive product or detergent that could mark the glass or the anti-reflective coating. The surface is preserved and the rinse dries without leaving any mineral trace.
Do you work at height safely?
Yes. Our technicians have the right equipment for working at height (telescopic poles to clean from the ground where possible, rooftop safety devices otherwise) and follow the safety rules. You don’t have to climb onto your roof.
Indicative pricing
How much does a cleaning cost?
2026 ranges — confirmed after counting the modules and checking access
| Service | Range | Typical lead time |
|---|---|---|
| Cleaning up to 10 modules | from 120 € | By appointment |
| Cleaning 10 to 20 modules | 160 – 280 € | By appointment |
| Cleaning more than 20 modules | on quote | By appointment |
| Ground / carport installation | from 90 € | By appointment |
| Cleaning + visual check package | on quote | By appointment |
The price depends on the number of modules, the surface area and the accessibility of the roof. On renovation (home over 10 years old), 6% VAT may apply to the labour.
Coverage
Our service areas
LiègeNamurCharleroiMonsBrusselsWavreVerviersHuyWaterlooLa LouvièreTournaiGemblouxNivellesMarche-en-Famenne
Your municipality isn’t listed? See all our areas.
Go further
Solar panels — go further
Customer reviews
They chose wendows
5.0/5 · 1verified reviews
A panel cleaning to schedule?
Tell us the number of modules and the type of roof: we offer you a slot and a clear price, with no commitment.
Reply within 24 working hours No obligation Grants & 6% VAT handled