A conveyor belt cleaner system comprising a platen positioned transversely of the conveyor belt; a steam chamber transversely disposed over a first portion of the conveyor belt, the steam chamber including a tubular steam header; a vacuum chamber adjacent the steam chamber and disposed over a second portion of the conveyor belt, the vacuum chamber having an outlet connectable to a source of vacuum; a first wiper in wiping contact with the conveyor belt defining an entrance to the steam chamber; a second wiper having a discontinuous wiping surface defining a septum between the vacuum and steam chambers; a third wiper defining an exit from the vacuum chamber; and apparatus including a rotatable bolt cooperative with the steam header to vary the width of steam application from the steam header onto the conveyor belt in accordance with a width of conveyor belt presented to the conveyor belt cleaner system.