Melbourne's Eureka Tower Window Cleaner Luke Lamont

One of highrise window cleaner Luke Lamont's co-workers gives a thumbs-up while cleaning Melbourne's Eureka Tower.

Meet Eureka Tower window cleaner Luke Lamont: Luke Lamont hangs off skyscrapers for a living. He is part of a team who clean windows on Melbourne highrise buildings including the Eureka Tower, Melbourne's tallest building. Cleaning the windows on a building that size is a mammoth task. "Something like Eureka you can get done in a month, a month and a half," he told 774 ABC Melbourne's Rafael Epstein. However that kind of speed depends on good weather conditions. "If you've got shocking weather it can take up to two, two and a half months."

Luke Lamont cleaning windows on the south-western side of Melbourne's Eureka Tower.

Eureka's windows are cleaned four times a year, which means Mr Lamont could spend up to six months a year just on one building. Most of the cleaning is done while standing in a box known as a Building Maintenance Unit (BMU). The tallest windows, though, can only be reached by abseiling from the top of the 297 metre tall building.

The longest abseil requires working from the 92nd floor down as far as the 56th - a drop of more than 120 metres. The 21-year-old said when he started the job he was "terrified of heights" but now he's much more comfortable. "You forget you're hanging 92 floors up in the air."

Highrise window cleaner Luke Lamont took these photos of a sunrise from the top of Melbourne's Eureka Tower.

Mr Lamont and his co-workers like to share photos of their workplace on social media. "It's pretty amazing up there," he said. "It's a great environment to work in and you see a lot of interesting things from up that high." Sometimes what is happening on the other side of the window is just as fascinating as the city views. "I've seen a few strange things, some of which I probably can't repeat."

Residents are told by building management when the cleaning is happening. "Some people choose not to listen to that and still get a shock when they turn around and we're hanging on the outside."

The job is not without its pressures. Luke's employer Briteway faces plenty of competition in the window cleaning business. "We definitely need to perform," said Mr Lamont. "Everyone's always looking for a cheaper price." "We've got to make sure we're producing the best quality work that we can."

A highrise window cleaner begins his descent down the side of the Eureka Tower.