Office workers swapped their computer screens for canoes to clear rubbish from a canal.
Staff from be:here and Prime Place, which signed an agreement to build Brentford FC's new stadium and associated housing, cleared 30 bags worth of rubbish from Brentford Lock.
Their haul, which they dredged from the waterway on September 8, ranged from plastic bags and lost footballs to tyres and metal crates.
Prime Place managing director Brian Brady said: "Events such as this are a great reminder to all involved in the regeneration of Brentford that it's not just about bricks and mortar but about providing a positive legacy within the community.
"As a result of the hard work of all those involved on the day, the canal is now a much cleaner place for both local wildlife and the community, and we want it to stay that way."
The stretch of water is used by Brentford FC Community Sports Trust to teach water sports to hundreds of children from local schools and youth groups each year.
The clean-up was organised by the Willmott Dixon Foundation, and volunteers were guided by the environmental charity Thames21. Prime Place is the residential arm of the developer Willmott Dixon.
