How often do you actually clean and maintain solar panels?

I’m curious how often everyone checks their solar panels after installation. Dust, bird droppings, leaves, and weather can gradually affect performance, especially in outdoor setups.

Do you follow a regular cleaning schedule, or only clean the panels when you notice a drop in output? I’ve also seen Callsun Solar Coupon Codes mentioned while researching solar equipment, but I’m more interested in hearing how people keep their panels performing well over the long term.