Diarrhoea and acute respiratory infection are leading causes of death in Kenyan children (WHO, 2010). In order to move toward Millennium Development Goal 4 to reduce childhood mortality, it is critical to address behaviours that can reduce these infections, eg handwashing with soap. The Kenyan Strategic Plan recommended targeting handwashing programmes to school children because they may be more amenable to behaviour change than adults and because they can act as advocates for behaviour change in their families and communities.