Bath and North East Somerset Council employee Phil Grant brushes the last of the algae and sludge from the city's lead-lined floor of the Great Bath.
It has been drained of all natural thermae spa water as part of the cleaning operation.
The original Roman baths are sited below today's modern street level.
And the site contains one of the best examples of a preserved Roman bath complex in Europe.
Previous clean-ups have revealed all manners of modern-day debris, including traffic cones, shopping trolleys and even a moped.
Accidentally re-discovered in the 1800s, the steps and lead lining of the Great Bath are more than 2,000 years old and visited by more than one million tourists a year.