From a leader in the field of psychotherapy, this new book is the first dedicated to the topic of the fear of contamination. The fear of contamination is the driving force behind compulsive washing, the most common manifestation of obsessive compulsive disorder. This is one of the most extraordinary of all human fears. It is complex, powerful, probably universal, easily provoked, intense, and difficult to control. Usually the fear is caused by physical contact with a contaminant and spreads rapidly and widely. The book starts by defining the disorder, before considering the various manifestations of this fear, examining both mental contamination and contact contamination, and feelings of disgust.Most significantly, it develops a theory for how this problem can be treated, providing clinical guidelines - based around cognitive behavioural techniques.