A variety of expert professionals are responsible for the modern world's cleanliness, even though many of their jobs and the hardships they face go unappreciated and unknown.

A variety of expert professionals are responsible for the modern world's cleanliness, even though many of their jobs and the hardships they face go unappreciated and unknown.

A forest of weeds in Chingford has consumed a back garden, leaving the pros to rely on jet washing to clear the debris out, and a pro cleaner takes on filthy swimming pools that are chock-full of algae.

Paul,Carl and Marc, in Banbury, clean everything from helicopters to private jets. This time they're facing a smaller aircraft, but it's no small task. Meanwhile in Birmingham, Sid and Jess take on their first ever shed clean.

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. Meanwhile, Gary and Jeff are taking on a carpet of moss in Hertfordshire.

A pair of friends use pressure washers to take on a never-before-cleaned roof covered with moss. Plus, a pair of cleaners in the Isle of Wight take on a crud-encrusted boat, and a couple in Bolton work to clear off a patio and driveway horror show.