Solar panel cleaning in California

Professional solar panel cleaning in California runs $120–$320 per visit, with most homeowners booking 2× / year along the coast and up to 3–4× / year in the Central Valley. The state's dry season does the damage: rain that rinses panels elsewhere mostly stops from late spring through fall, so whatever lands on your array stays there until someone removes it.

What lands on it depends on where you live. The Central Valley's tilled farmland throws agricultural dust for months at a stretch, metro basins add traffic and industrial particulate, spring brings heavy pollen, coastal neighborhoods get a film of salt haze, and a single smoky week of wildfire season can coat every panel in a zip code with ash.

That geography shows up in our grime index. Fresno ranks 1 nationally — the fastest-soiling metro in the country — with a Jun–Oct dust season and a recommended 3–4× / year cadence at $120–$260 per clean. Los Angeles sits at rank 5, where traffic film and ash during the Jul–Oct season call for 2–3× / year at $150–$320. San Diego's shorter Aug–Oct dry stretch puts it at rank 18; there, 2× / year at $140–$300 usually keeps output steady.