Britain is an island obsessed with cleaning. But we're not as clean as we'd like to think and the 400,000 men and women who do our dirty work know the truth. Unseen and unheard, they keep our filth out of sight and prevent us from drowning beneath our mountains of waste. As Dirty Britain returns for a second two-part series, we uncover the truth about the grime hidden within our green and pleasant land.

In episode one, we meet portaloo cleaners Alex and Silvo from Essex. Alex explains: "You'd be surprised how people actually leave them and you think, ‘What's it like at their house?' It's a dirty job."