Man cleans windows 40ft in the air without a harness - video
The window cleaner was captured on camera by a passer-by in Bath, and can been seen clambering over balconies and pillars to complete the job.
According to the Daily Mirror, Bath council's health and safety department is now launching an investigation into the identity of the daredevil, who scaled narrow ledges and cornices at a height of over 40ft (12m).
The restaurant that owns the windows featured in the three-minute clip is also said to be involved.
"We were shocked," said a spokesman for the business. "We take health and safety extremely seriously."