How (and Whether) to Clean Solar Panels

For most homeowners in most climates, solar panels need far less cleaning than people assume — rain does most of the work.

When cleaning actually helps

Dry, dusty climates (parts of Arizona, Nevada, inland California) and areas with heavy pollen season, wildfire ash exposure, or significant bird activity near the array can see a measurable production drop between rains. If your monitoring app shows a sustained, unexplained output decline (not just a cloudy week), a buildup check is a reasonable next step.

Safe DIY cleaning

If your panels are easily and safely reachable from the ground: use plain water and a soft, non-abrasive brush or squeegee on an extension pole. Avoid cleaning in direct, hot midday sun (thermal shock risk to the glass) and never use a pressure washer, abrasive pads, or harsh chemicals, which can damage the anti-reflective coating or seals.

When to call a professional instead

• Steep or high roofs where DIY access is a genuine fall risk
• Systems still under a workmanship warranty where unauthorized roof access could complicate a future claim
• Heavier buildup requiring specialized equipment

What not to worry about

Light dust and normal seasonal pollen typically wash off in the next rain and aren't worth chasing with frequent manual cleaning. Most studies on this find the incremental production gain from very frequent cleaning doesn't outweigh the cost of paying a professional service to do it often — an occasional check (once a year or so, more in dry climates) is the realistic norm.