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By different methods
1) Aerial work platform by skilled manpwer using ScissorLift
2) Suspended Platform or cradle, rails
3) Windowsill access
4) Automated Facade Cleaning System - GEKKO
Uses Suspended platform to perform this particular activity.
like.
1. Using of cradle to clean the glass
2. Rope way access
3. suspended boatswain`s chairs
NB: need competency for using such equipment.