Solar panel cleaning in Brisbane

Deionised water has had its minerals stripped out, so it dries without leaving anything behind: no spots, no film, no residue cutting the light getting through. Ordinary tap water dries and leaves the exact mineral deposits you were trying to remove.

It also means no detergents. Detergent residue attracts dust, so a panel cleaned with soap is often dirtier a month later than one that was never touched.

And why not a pressure washer

Panels are glass over a sealed electrical assembly. High pressure can force water past the seals and micro-crack the surface, and both tend to show up as lower output long after whoever cleaned them has gone. We use low pressure and soft brushes, always.

Dust, pollen, bird mess and salt in the bayside suburbs all build a film that cuts output. Most systems benefit from a clean about once a year, more if you are under trees or near the coast.