Solar panel cleaning in Los Altos Hills.

Solar panels degrade in output as dust, pollen, and biological film accumulate on the glass surface. Most homeowners discover the drop only when checking quarterly generation reports — by which point the panels may have lost five to fifteen percent of their output for the season. Periodic cleaning restores most of that loss, but requires the same height-access discipline as architectural glass work.

In Los Altos Hills, the conditions of the Mid-Peninsula hillside market sharpen the need. Solar panel installations are common on Los Altos Hills homes, and the hillside orientation often places them at angles where periodic cleaning has outsized impact on generation output.

1. Roof-access assessment and verification of partner panel-safety protocol.
2. Pre-clean rinse to lift surface debris before any agitation.
3. Deionized-water cleaning with soft-bristle or pole-fed technique appropriate to the panel surface.
4. Final inspection and a note on any panel showing visible film not lifted by the cleaning.

• Annual maintenance, or twice yearly for homes in dust-heavy or pollen-heavy environments.
• When generation reports show output dropping below seasonal expectation.
• After construction, fire, or wildfire smoke event where panels may have accumulated unusual residue.
• Pre-sale, where panel condition factors into the home’s documented system value.