Los Angeles, CA -- British queens of clean Kim Woodburn and Aggie MacKenzie have mucked through some of the most disgusting domiciles in the U.S. and U.K. for their TV series, "How Clean is Your House?"

Yet, the two admit there are still some hygiene horrors that leave them reeling -- and most of them have occurred in the smallest room of the house.

In Woodbury's words, "Filthy toilets never cease to shock us -- no one gets used to that!"

Sometimes, though, it's the places other than the bathroom where inhabitants choose to "do their business" that get the two house pros's stomachs churning.

MacKenzie says they once had to tackle the home of a British woman who owned 11 parrots which were allowed to fly free in the house and "every single surface of her house was dripping with bird poop," -- even her coffee mugs.

Such cases are extreme, but Woodburn and MacKenzie say even those can be remedied using their tips, which appear in the new book "How Clean is Your House?" (Dutton)

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