Most Virginia solar panel systems benefit from professional cleaning once or twice per year, but the exact frequency depends on your specific location and environmental factors. If your property is surrounded by tall trees, you’ll likely need more frequent cleaning due to leaf debris and bird droppings. Properties near highways, farms, or construction areas typically accumulate dust faster and may require additional cleanings. The key is monitoring your system’s energy production—if you notice a consistent drop in output that isn’t explained by weather or seasonal changes, it’s time for a cleaning. Virginia’s rainfall helps keep panels clean between professional services, but it can’t remove everything. Bird droppings, tree sap, and cemented-on dirt require professional attention to avoid permanent damage to your system’s efficiency.