Maintenance
Does cleaning solar panels actually increase output?
Yes. In dry, dusty Southern California conditions, soiled panels commonly lose 5–20% of their output, and coastal salt film or bird droppings can push individual panels higher. Cleaning with deionized water and soft brushes restores most of that loss without abrasives or harsh chemicals.
The short version
Yes. In dry, dusty Southern California conditions, soiled panels commonly lose 5–20% of their output, and coastal salt film or bird droppings can push individual panels higher. Cleaning with deionized water and soft brushes restores most of that loss without abrasives or harsh chemicals.
- Deionized water dries spot-free, so no mineral film is left behind.
- Never use household detergents or stiff brushes — they scratch the anti-reflective coating.
- Once or twice a year suits most Orange County installations.
- Panels are cleaned early in the day while the glass is cool.
Related questions
- Will cleaning void my solar warranty?
- Not when it's done with deionized water and soft brushes at low pressure — the method most manufacturers specify. Abrasive pads and high-pressure washing are what void warranties.
- How often do solar panels need cleaning near the coast?
- Twice a year is typical near the coast because salt film bonds faster than inland dust.
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