It seems like a job fit for only thrill-seekers or extreme sportsmen.
But for the workers cleaning the exterior of the Shanghai Tower skyscraper in Pudong yesterday, it is simply all in a day's work.
The 632m-tall building built by Gensler is China's tallest building.
Its asymmetrical form, tapering profile and rounded corners all help the building to withstand the strong typhoon winds that are common in Shanghai.
This form reduces building wind loads by 24 per cent, resulting in a lighter structure that saved US$58 million (S$81.5 million) in costly building materials.
Designed by US architecture and design company M. Arthur Gensler Jr. & Associates, the Shanghai Tower, in the city's Lujiazui district, was completed last summer.
It is owned by a consortium of Chinese state-owned companies.