Clarity 2010 was held at the Universidade Nova de Lisboa, a fantastic facility with beautiful spacious modern architecture. The loo doors attracted a certain amount of comment - the inset handles were typical of sliding doors, and the Portugese word Puxe made you want to push. Puxe means 'pull' however, which wasn't all that easy.
Once inside you were rewarded with this very thorough 12-stage model of the hand-washing process.