Clearners and the buncket of water

Cleaners tackle the world's tallest skyscraper, which stands 206 storeys high and has 24,438 windows (that's 120,000 square metres of glass)

Despite the high-tech cleaning operation, which cost £5million to set up, workers still use traditional soapy water and squeegees to clean the windows

The 828-metre Burj Khalifa cost £1billion to build and it has been the tallest building in the world since it was officially unveiled in 2010