Picture this: window cleaners dangling from skyscrapers, defying gravity to scrub grime off glass—a heart-stopping sight. But now, a cutting-edge robotic squad is stepping in, turning this perilous job into a high-tech spectacle!   In Nanjing, a robotic cleaner and drone duo recently wowed onlookers as they tackled a towering skyscraper. Operated remotely from the ground, the robot’s agile arm scrubbed the glass curtain wall while its drone partner blasted stubborn dirt with precision high-pressure jets. Working in flawless harmony, they left windows gleaming—three times faster than human crews.   Beyond speed and savings, this innovation eliminates life-risking labor, blending efficiency with human-centric progress. Smarter cities aren’t just about tech—they’re about safer, kinder futures.