Solar panels, cleaned the right way.

Panels live in the weather and collect what it carries: dust, pollen, ash in fire season, and the chalky film hard water leaves when sprinklers overspray. All of it sits between the sun and the cell. Rain rinses off the loose dust and leaves the film — which is why panels that “get rained on all winter” still look hazy in June.

Glass, coatings, and live electrical equipment — a solar array is the one surface where gentle isn’t optional.

What safe actually means on an array

Pure water, not chemistry. Panels get pure water and soft brushes — no detergents, no minerals left behind to bake into new spots. The strong chemistry is for the roof surface around the array — never the glass.

No pressure. High pressure can crack cells and force water past the seals. Nothing stronger than a gentle rinse ever touches the array.

Timing matters. Hot glass and cold water don’t mix — panels get cleaned when the array is cool, early or late in the day, so the temperature swing never becomes your problem.

Because panels share a roof with the growth a roof wash treats, the two are booked together whenever it makes sense: the roof gets its soft wash, the array gets its pure-water rinse, one visit, one written report covering both. The full method is on the solar panel cleaning page; the roof side is on roof cleaning.