Thanks to its flexible angle, the Variogelenk for Kärcher telescopic poles allows for more effective, thorough, and user-friendly cleaning of solar panels with the roller brush 500. By simply rotating the telescopic pole, the roller brush can now be easily controlled left and right. This way, the brush automatically moves in the desired direction, significantly reducing the user's effort. Complete cleaning of edge areas of the solar panel is also easily achievable, as tilting the brush allows it to be guided over the edges of the panel, ensuring all areas are covered. Furthermore, the combination of the telescopic pole, Variogelenk, and roller brush 500 is also excellent for cleaning glass facades or, for example, conservatories.