Is Wim Wenders back? If he is, I’m not sure it’s such a good thing. Perfect Days, the tenth film by the German director to compete at Cannes, is a working-class yarn about the pleasantly banal routines of a toilet cleaner named Hirayama (Yakusho Koji), a beguiling loner with a beautiful soul who is harbouring a trauma that is never fully articulated by the film. Sound familiar?