David discovers a load of sex toys dumped in a farmer's field and Ray wages a one-man war on the irresponsible dog owners of Dorset. Clive and Callum face the prospect of cleaning up roadside laybys covered in human effluent.

David sets up a hidden camera to catch a flytipper in the act, while Gary follows a disturbing trail of used needles deliberately left in playgrounds and parks. Mick and Danny track a shopkeeper who is illegally dumping rubbish.

Enforcement officers Wayne and Dan continue their mission to identify the gang responsible for one of the biggest fly tips in Cardiff, more determined than ever to catch their prey. Environmental health officer Suzanne pays a visit to a takeaway restaurant in Worcester, and a London canal side is the scene of a battle between council enforcers and a waste-loving artist who has hoarded mountains of rubbish.

Enforcement officers Wayne and Dan tackle rubbish dumped from illegal cannabis factories, while environmental health officer Juliet performs a surprise inspection of a takeaway. Plus, cleaners Caz and Tee face houses so filthy they need shovels to clear the layers of grime and animal excrement.

Enforcement officers Dan and Jude are on the hunt for fly-tippers and rubbish dumpers blighting the beautiful countryside of the Malvern Hills, while Rob, Gary and John deal with the rivers of fat and wet wipes blocking London's sewers. In Wolverhampton, cleaners Jakob and Wojtek face a toxic clean-up thanks to someone storing 50 bottles of urine in a cupboard, while across the city a crime scene is in urgent need of a deep clean.

The first episode features enforcement officers Wayne and Dan, who are on the hunt for fly-tippers. Their job is to investigate tips across Cardiff to try to find crucial evidence that will lead them to who dumped the rubbish.