How Often Should Solar Panels Be Checked and Maintained?

I’ve been thinking about how much routine maintenance different equipment around a home actually needs. Solar panels seem like one of those things that are installed and then mostly forgotten, but dust, pollen, leaves, and other buildup can accumulate over time.For people who have solar systems, how often do you normally inspect or clean the panels? Do you handle the cleaning yourself, or do you prefer hiring Solar panel cleaning services when the panels need more thorough attention?I’m also curious whether people have noticed any meaningful difference in performance after cleaning their panels. It would be useful to hear what kind of maintenance routine other homeowners follow.