Make every panel pay.

Since its establishment in 1970, the company has been dedicated to tackling environmental challenges by effectively breaking down both organic and inorganic soil deposits, ultimately restoring power output and maximising revenue potential sustainably for the power generation sector.

Why chemistry matters for PV output

Solar modules don’t just catch light - they catch hydrocarbons (diesel, soot, oily road film, lubricants etc), bird droppings, dust, pollen, insects, algae, lichens, as well as agricultural and marine aerosols, among other local pollutants. Water-only cleaning struggles here: water does not dissolve hydrocarbons, so it cannot emulsify and lift oily residues effectively. You end up with extra passes and, in hard water, new mineral spots that still scatter light and attract more dirt.

R-MC S21™ uses surface-active, pH-neutral chemistry to wet, penetrate, and emulsify hydrocarbon/organic soils, so they release quickly and rinse film-free. The neutral formulation helps protect AR coatings, frames, and seals, while the residue-free, antistatic finish slows re-soiling—meaning fewer passes, less water, and more sunlight reaching your cells. It’s also independently tested by Fraunhofer CSP for material compatibility under specified conditions, so you get confident cleaning without compromising PV components.

Developed for PV materials

R-MC S21™ broad-spectrum surface-active chemistry, pH-neutral; antistatic; readily biodegradable; designed not to harm AR coatings, frames, or seals when used as directed; works with manual, brush, and robotic systems.

Fraunhofer CSP material-compatibility testing (independent)

  • What was tested: 
    AR-coated PV glass, anodized aluminum frames, silicone edge seals. 
  • Method & standards: 
    Immersion at 1:199 application concentration; evaluations aligned to DIN 50905 and BAM ST/SG/AC.10/11/Rev.5, section 37.4.1. 
  • Headline results: 
    No change in AR optical properties; no corrosion/material degradation; no visible structural damage under test conditions.

FAQ’s

  1. Has S21 been independently tested on PV materials?
    Yes. Fraunhofer CSP tested S21 at a 1:199 application concentration per DIN 50905 and BAM ST/SG/AC.10/11/Rev.5, section 37.4.1 on AR glass, anodized aluminum, and silicone seals; no corrosion, optical change, or visible damage was observed under the test conditions. 

  2. What are the headline results?
    AR-glass: transmittance change ≤ 0.1% after 24 h;
    Aluminium: relative mass loss ≤ 0.1% after 168 h;
    Silicone: relative mass loss ≤ 0.05% after 168 h. 

  3. Is S21 safe for anti-reflective coatings and seals?
    Yes, it’s pH-neutral and designed for PV materials; Fraunhofer CSP observed no change in AR optics and no material degradation under the test conditions. Always follow label and equipment guidance. 

  4. Can I use it with brush or robotic systems?
    Yes, S21 is compatible with leading brush/robot workflows. Use the recommended dilution for your equipment and water quality.

  5. How often should large arrays be cleaned?
    It depends on climate and soiling. Contact us to discuss in more detail.

  6. Does S21 leave residue that attracts dust?
    No, S21 is designed to rinse clean and includes antistatic properties to help reduce re-soiling.

R-MC S21™ is available in concentrated form as C199, offered in 25-litre, 200-litre, and intermediate bulk containers (IBCs), providing flexibility and convenience for various cleaning requirements.