Green Energy

The study found that the optical properties of the studied anti-reflective coating on solar panel glass did not deteriorate as a result of chemical cleaning—except when dishwashing detergent was used.

It is unlikely that dishwashing detergent damages the glass. However, rinsing does not seem to be sufficient, as the transmittance of the solar panel glass cleaned with detergent did not return to the pre-cleaning level after the rinsing.

"Even though the glass looks clean when cleaned with detergent, its ability to transmit light is significantly impaired. Therefore, a clean-looking end result does not guarantee optimal performance," says Research Assistant Julianna Varjopuro.

TL;DR - dish cleaner removes the anti-reflective coating but glass cleaner does not. And once lost, it does not come back.