Meet the Scrobby: a handy robot that can keep your solar panels clean. It is designed to scrub your solar panels clean without any power source. In fact, it does not even need water as long as you get enough rain in your area. It has an array of sensors that map your solar panel installation. Users can change its cleaning schedule on their smartphone.
Since Scrobby has Bluetooth, its settings may be controlled using its app. By default, it will complete 3 full cleans per year. You will get a robot, a resting platform, and mounting posts and fasteners with your purchase. The project is on Kickstarter.