Solar Panel Cleaning

Does Cleaning Solar Panels Actually Increase Output?

What the data says about soiling losses — and how often SoCal arrays really need a wash.

SoCal House Washers · April 15, 2026 · 4 min read

Solar panels have no moving parts, so it's easy to forget they need maintenance. But a layer of dust, pollen, and bird droppings can quietly eat into your production.

How much output do dirty panels lose?

Soiled residential panels commonly lose between 5% and 20% of their output, and even more in dusty or high-pollen areas like much of Southern California. Cleaning removes that buildup so your array produces closer to its rated capacity.

5–20%

Typical output lost to soiled panels

Industry soiling-loss studies

How often should you clean them?

For most SoCal homes, quarterly cleaning keeps output high given our dust and dry seasons. A maintenance plan handles it automatically so you never have to think about it.

💡Clean safely

Use soft tools and deionized water — never abrasive brushes or high pressure that could damage cells or seals. When in doubt, a professional cleaning protects both your output and your warranty.