Soft, soft water, and never a hot panel

The best solar panel cleaning kit for 2026

Dust and pollen cost a few percent of output, and a bird leaves a shadow that a bypass diode has to work around, so panels are cleaned — carefully, because the surface is coated glass and the frame carries live wiring underneath. The tools on this shelf are specified by their brush head: the bristle material and softness, the width, and whether the head pivots to follow a tilted panel. The pole is the other half — its extended reach, its material and how much it flexes at full length, which decides whether the brush is being pressed or waved. A water feed through the pole turns the brush into a rinse, and the water itself matters: hard water dries into the spots the cleaning was meant to remove, which is why deionised feeds exist. A squeegee and a drying blade finish the job without streaks. Cleaning agents supplied with a kit should be read against the panel maker’s instructions, which typically forbid abrasives and solvents and advise against cleaning a hot panel with cold water. We compare brush head and bristles, pole reach and material, water feed, squeegee and supplied agents.

Every part on this shelf, side by side

1. 

   Schlauputz 1 L concentrate at 1:20, nano sealant, acid-free, made in Germany

   A one-litre solar panel cleaning concentrate diluted 1:20 for up to 20 litres, with a hydrophobic nano sealant and no hydrochloric, phosphoric or sulphuric acid.

   Brush head

   NONE — this product is a cleaning liquid, not a cleaning tool

   Bristles

   None

   Pole reach

   None

   Material

   A liquid concentrate; the listing states it is free of hydrochloric, phosphoric and sulphuric acid and describes good biodegradability, fourth bullet

   Water feed

   None — dilution is 1:20 with water, fifth bullet

   Squeegee

   None

   Supplied agents

   1 litre of concentrate making up to 20 litres of cleaning solution, with a hydrophobic nano sealant applied in the same step, first, second and fifth bullets; developed and manufactured in Germany. An efficiency gain of up to 10 % from clean modules is claimed in the third bullet with no source or method

   Amazon reference

   B0DG34HZ23 (same reference on 1 Amazon marketplace)

   EAN

   4270004348415

   • Three acids named as absent, rather than a general safety claim
   • The dilution and the yield are both published: 1:20, up to 20 litres
   • It is a liquid — brush, bristles, pole, water feed and squeegee are all absent by nature

   Best for: Bird mess and pollen on a panel you can already reach.

   ≈ €18

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2. 

   AGO SAUBERKEIT FÜR HAUS UND GARTEN! 2 L concentrate at 1:10, self-acting against algae and lichen, biocide

   A two-litre solar module cleaning concentrate diluted 1:10, acting on algae, lichen and biofilm without brushing, pressure or rinsing.

   Brush head

   NONE — this product is a biocidal cleaning liquid, not a cleaning tool

   Bristles

   None

   Pole reach

   None

   Material

   A liquid concentrate described as gentle on materials, protecting the anti-reflective coating, the seals and the frame, third bullet

   Water feed

   None — dilution is 1:10 with water and the solution is sprayed on, fifth bullet

   Squeegee

   None

   Supplied agents

   2 litres of concentrate at 1:10; it acts on algae, lichen and biofilm without a pressure washer, requires no working in and no rinsing off, and the active substance stays in the surface to prevent regrowth, first, second and fifth bullets. The listing states: biocidal products are to be used with care, and the label is to be read before use. An increase in solar yield of up to 10 % is claimed in the fourth bullet with no source or method

   Amazon reference

   B0H2DQPDLQ (same reference on 1 Amazon marketplace)

   EAN

   4260235736310

   • No brushing and no pressure washer, which protects the anti-reflective coating
   • A long-term effect against regrowth rather than a single clean
   • It is a liquid — five of the seven lines on this shelf are absent by nature

   Best for: Green growth and lichen on a roof-mounted array nobody can reach safely.

   ≈ €65

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3. 

   Briliantwerk 6 m aluminium telescopic brush, 33 cm head, four jets, 10 m hose

   A telescopic washing brush extending from 1.2 to 6 metres with a 33 cm head, four water jets at the head, a soap dispenser and a ten-metre hose.

   Brush head

   A 33 cm head, flexible so it can be set flat, vertical or angled, fourth and fifth bullets

   Bristles

   Soft bristles for photovoltaic cleaning, removing dust, pollen and loose deposits with water alone, third bullet

   Pole reach

   Continuously adjustable from 1.2 m to 6 m, fixed by a clamp lock, first bullet

   Material

   An aluminium telescopic pole, first bullet

   Water feed

   Four water jets distributing water directly at the brush head, fed from a garden hose; a 10 m hose is supplied, second and fifth bullets

   Squeegee

   Nowhere in the listing

   Supplied agents

   No cleaning agent is supplied; the set contains the aluminium pole with the brush head, a 10 m hose, a soap dispenser and a connection set, fifth bullet

   Amazon reference

   B0GTBDPWNR (same reference on 6 Amazon marketplaces)

   EAN

   4262433720375

   • Six metres of reach, so a roof array is cleaned from the ground
   • Four jets at the head rather than water running down the pole
   • No squeegee, so the glass dries however it dries

   Best for: Washing a roof or a carport array without leaving the ground.

   ≈ €85

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4. 

   LyriFine 6.2 m electric brush, two speeds, 2000 mAh battery, 100 ml foam tank

   An electric telescopic washing brush reaching 6.2 metres, with a 2000 mAh battery, two cleaning speeds, a 100 ml foam tank and a continuous water connection.

   Brush head

   A powered rotating head with two cleaning speeds, second bullet

   Bristles

   Nowhere in the listing — the bristle type and stiffness are not described

   Pole reach

   An extendable water-fed pole stretching from about 1.48 ft to 20 ft, locking securely, sixth bullet — approximately 0.45 m to 6.2 m

   Material

   A high-quality aluminium telescopic pole, fourth bullet

   Water feed

   A continuous water connection so cleaning need not stop to refill, plus a built-in 100 ml tank producing a fine-pored active cleaning foam, third and fifth bullets

   Squeegee

   Nowhere in the listing

   Supplied agents

   No cleaning agent is supplied; a 2000 mAh lithium battery drives the head, with an instruction to charge it fully before storage — if the charge falls too low the battery enters a protective sleep state, first and second bullets

   Amazon reference

   B0F6TXL3QX (same reference on 6 Amazon marketplaces)

   EAN

   0647697074299

   • A powered rotating head with two speeds, which does the scrubbing instead of your arms
   • A 100 ml foam tank, so detergent arrives at the glass rather than running off the pole
   • The bristle type is not described, on a powered brush touching coated glass

   Best for: A large array where the scrubbing itself is the tiring part.

   ≈ €120

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