The expert professionals responsible for the modern world's cleanliness. Many of their jobs and the hardships they face go unappreciated and unknown.

Two boat cleaners face off against a boat that's been sitting in the water for five years.

Cleaners in Swindon work to clear over 11,000 solar panels of a layer of bird droppings.

A car cleaner in Somerset works on polishing off a sports car covered in mud.

A pair of friends use pressure washers to take on a never-before-cleaned roof.

Gary and Jonny have a very important client as they tackle the filth on a church entrance that's covered in carbon. Luckily, Gary is an expert in cleaning historic buildings — but can he salvage this one? Filth-fighting father Gary and son Jeff are taking on a carpet of moss in Hertfordshire. Years of growth needs to be demolished, but this duo plan to do their worst. And over in Edinburgh, Stephen, Liam and James hope to make a penguin pool pristine again. Can our dirt-destroying divers work their magic?

A team of Banbury cleaners work on aircraft, ranging from helicopters to private jets. Today's assignment is a small plane that has not been cleaned in three years.

The expert professionals responsible for the modern world's cleanliness. Many of their jobs and the hardships they face go unappreciated and unknown.

The expert professionals responsible for the modern world's cleanliness. Many of their jobs and the hardships they face go unappreciated and unknown.

The expert professionals responsible for the modern world's cleanliness. Many of their jobs and the hardships they face go unappreciated and unknown.