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"Writing about the future, I have a vested interest in there being a future for me to write about."
- John Brunner

Window-Cleaner Robots  
  Robots that perform the task of cleaning and polishing transparent surfaces.  

The cylindrical ship Rama had enormous lighting strips; how to keep them clean?

There were the "window cleaners," with large padded feet, who were apparently polishing their way the whole length of Rama's six artificial suns. Their enormous shadows, cast right across the diameter of the world, sometimes caused temporary eclipses on the far side.
Technovelgy from Rendezvous With Rama, by Arthur C. Clarke.
Published by Harcourt Brace Jovanovich in 1972
Additional resources -

The Window Cleaner robots are really "biots", biological robots that have stored energy cells like electric eels.

Compare to Window Willie from Door Into Summer (1956) by Robert Heinlein.

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Additional resources:
  More Ideas and Technology from Rendezvous With Rama
  More Ideas and Technology by Arthur C. Clarke
  Tech news articles related to Rendezvous With Rama
  Tech news articles related to works by Arthur C. Clarke

Window-Cleaner Robots-related news articles:
  - Winbot Scrubs Your Windows
  - Ecovacs Winbot 7 Window-Cleaning Robot
  - SINTEF Robot Cleans Solar Panels
  - BladeBUG Robots Clean Massive Wind Turbine Blades
  - Solar Powered Robot Cleans Up Solar Panels For Free
  - Solar Panel Cleaning Robots

Articles related to Robotics
Your Window For Being A Tesla Optimus Remote Operator May Be Closing
Waymo Autonomous Cab Hits Autonomous Delivery Robot
Jizai Arms 'Free Limbs' Wearable Cyborg Arms
SwagBot Robotic AI Cattle-Herding From Down Under

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