The solution uses a so-called SolarBrush, a drone attachment that sweeps across the surface of the panels, brushing dirt and dust to the ground below. Ridha Azaiz, a German engineer and founder of Aerial Power, says one advantage of his solution over other robot cleaning systems is that it can cover an entire solar farm through pre-programmed flight paths. This means they don't need to be moved manually from row to row, a task which in itself can prove labor-intensive.