2x6 - Birds of a Feather

Tracey is disgusted by the state of Sharon's bedroom and it also appears Sharon's poor levels of hygiene have spread throughout the house when Tracey discovers they have mice. After cleaning the house and buying poison, Sharon buys a cat, but it does not seem to have any effect. Eventually, Sharon rings pest control, who reveals that he has been at Dorien's house trying to get rid of a major mice infestation and the mice have come from her.