In front of the main building of the Greater Bay Area Data Application Industrial Park, an innovative demonstration drew widespread attention — a professional drone equipped with a high-pressure sprayer and rotating brush steadily took off, hovering close to the glass curtain wall of the high-rise. As the operator adjusted the controls, the drone began an automated cleaning process, spraying cleaning solution and scrubbing away years of accumulated dust. Within moments, the dull façade started to regain its original shine — a vivid example of how low-altitude economy is reshaping urban services.