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A liquid, not a brush

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.

Schlauputz solar panel cleaner concentrate bottle, one litre

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
Check price on Amazon

Specifications

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

A bottle, not a brush.

A bottle, not a brush

One litre of concentrate, diluted 1:20 with water, making up to twenty litres of cleaning solution. There is no brush, no pole, no water feed and no squeegee — five of the seven lines on this shelf describe a tool, and this is a chemical.

What it claims to remove

Bird droppings, moss and pollen. The three things that actually shade a panel, as opposed to the thin film of dust that barely does.

What is absent from it

Hydrochloric acid, phosphoric acid and sulphuric acid, all three named. Described as readily biodegradable.

Naming what is not in a cleaner is more useful than describing what is: those three are what attack an anti-reflective coating and the seals around a frame.

The sealant

A hydrophobic nano layer applied in the same pass, so rain beads and carries dirt off rather than drying on the glass.

How long it lasts is not published. That is the question worth asking, because a sealant that survives one month of weather and one that survives a season are very different purchases.

The figure to treat carefully

Up to 10 % efficiency gain, third bullet. No source, no method, no starting condition.

A filthy panel can lose that much; a lightly dusty one loses very little. The number describes a best case, and the listing does not say so.

Availability

German Amazon store quoted about 18 € when this page was compiled.

American, British, French, Italian and Spanish Amazon stores returned nothing at all, so the buy button there runs a search instead of landing on an empty page.

These figures are what Keepa reported on the day this page was last updated. Availability and pricing move without notice.

Prices quoted in this text were read on 16 September 2026. The live price is at the top of the page.

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