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"I did more research, and realized I almost would rather be a biologist than a writer, because there was incredible stuff going on!"
- Greg Bear

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
DIY Robotic Content Farming
Vero Robotic Dog With Vacuum Cleaner Feet
Boy Makes Biomimetic Turtle Robot
Origin F1 Humanoid Robot's Facial Skin

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