The top 111 meters of the world’s tallest structure have to be cleaned by human window-washers.
Key Facts
The team that cleans the Burj Khalifa’s topmost windows rappels with ropes and uses buckets with squeegees.
When wind hits very tall buildings, it can form small whirlwinds that create low-pressure areas.
It takes around 3 months to clean all of the Burj Khalifa’s 24,000 windows. On levels 40, 73 and 109 of the Burj Khalifa, a huge bucket machine washes the surrounding windows by moving along a track and travelling vertically with cables.
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