Kim Woodburn and Aggie MacKenzie are back for a fifth series of their ever-popular How Clean Is Your House? , and this time the country’s filth offenders are in for a few surprises.

Spy cameras, high street naming and shaming and a raft of new science toys make this the boldest, cheekiest series yet.

In 2007, surveillance cameras reveal the full nature of the grime crimes. For the first time Kim and Aggie and their viewers can see how these mucky pups actually function in their own environment – brushing teeth over what looks like an open sewer of a toilet or preparing food in a crawling toxic environment: it’s not for the faint hearted! More than a few mice put in an appearance.

Aggie brings her own incentive to the cleaning in the form of a battery of new science tests and gadgets revealing everything from the levels of dust mite infestations, to the amount of energy generated by colonies of bacteria. There are still some video nasties of boils and carbuncles for those who need a little more encouragement to clean-up.

And anyone deluding themselves about the state of their home, is quickly put right when Kim and Aggie take them on to the high street to get their neighbours views on how they live….and the Great British Public doesn’t pull any punches!

Now Kim and Aggie are exacting a higher price from their domestic delinquents…. this time round there’s no shirking responsibility for putting things right. Blood, sweat and elbow grease is expected in direct proportion to the amount of muck they’ve made. For some it’s a trial that brings out the bully in Kim, others discover a long dormant clean gene and lead from the front.

Through the tears and trauma, the phrase “life-changing” is the one most often used when these filth offenders let Kim & Aggie through their front door.

How Clean Is Your House? first stamped its mark on Channel 4 in 2003. Kim and Aggie quickly established themselves as the nation’s favourite cleaning queens and their series have continued to attract more than three million viewers a week. Their unique approach of berating and ultimately rehabilitating some of the grubbiest householders in Britain has won a huge army of fans. Lemon juice and vinegar sales are a testament to their loyal following. More than 1,000 people applied to take part in series five, showing the nation’s appetite to invite the top grimebusters through their front doors continues to grow.

The show returns to Channel 4 on the 17th May at 8PM