Enter your system size, estimated soiling loss, and cleaning cost to see if a cleaning pays for itself in a season.
Soiling loss varies enormously by location — arid, dusty, or pollen-heavy areas see meaningfully more buildup than regions with regular rain naturally rinsing panels.
Most residential solar arrays see 2-5% production loss from typical dust and pollen buildup between rains, though dry regions or panels at a low tilt angle can see higher losses. Cleaning pays for itself fastest in dry climates with high soiling and high electricity rates — check your local rainfall pattern and this calculator's payback estimate before scheduling a service, since regular rain often does the job for free.
Moderate to heavy rain generally rinses off loose dust and pollen well, though it doesn't remove more stubborn grime like bird droppings or sap — in regions with regular rainfall, professional cleaning is often unnecessary.
For ground-mounted or easily accessible panels, yes it can save money — but roof-mounted panels carry fall risk and potential warranty concerns from improper cleaning technique, which is why many installers recommend a professional service for rooftop arrays.