Is Solar Panel Cleaning Worth It? What the Data Says

Solar panel cleaning is a hot topic — some companies will charge you $200-400 to clean your panels, promising huge production gains. But is it actually worth it?

What the Research Shows

Studies consistently show that dirty panels produce 5-25% less electricity depending on the type and amount of soiling. Bird droppings, pollen, dust, and construction debris are the worst offenders.

When Cleaning Makes Sense

Cleaning is worth it if you live in a dusty area, near construction, or if birds frequently perch on or near your panels. It's also worth it if your panels are flat-mounted (no tilt), since rain won't naturally wash them clean.

When It Doesn't

If you live in an area with regular rainfall and your panels are tilted 15+ degrees, rain usually does a good enough job. Paying $300 to recover $50 of production doesn't make financial sense.

How to Know for Sure

The best way to know if dirty panels are costing you is to monitor your system's health score over time. If your SolarDoctor health score drops gradually over months, soiling might be the cause. Clean your panels and see if the score recovers.