Israel’s Bladeranger (see here previously) has completed a pilot to clean the glass roofs of railway stations in Germany. It hopes to clean the roofs of all 5,400 German railway stations. Bladeranger will also work with Israel’s Propellor Drones to clean the solar fields of Israel’s Electra.
https://en.globes.co.il/en/article-bladeranger-drones-clean-german-station-roofs-1001484807
https://www.israel21c.org/israeli-drone-fleet-aces-mission-to-clean-german-rooftops/