There is a Website which contains a summary of current best practice for treating OCD (American Consensus document) in children and adults: www.psychguides.com/ecgs8.php

It is in two parts, the first directed at professionals and the second at families:

A. Guidelines for the Treatment of Obsessive-Compulsive Disorder
B. A Guide for Patients and Families

This reference also contains an authoritative review of treatments:

Rapoport, J.L. and Inoff-Germain, G. Practitioner Review: Treatment of Obsessive-Compulsive Disorder in Children and Adolescents, J. Child Psychol. Psychiat. Vol.41, No.4, pp. 419-413, 2000