A device for wiping the surfaces or rotors used to portion mixed materials. The device removes adhering materials, such as cookie dough, from the cutting or metering surfaces. Typical application is for use in large automated bakeries or cookie manufacturers wishing to transport larger slabs or chunks of cookie dough from a mixer to machines which portion the dough prior for baking or freezing. The device has a wiper located proximate to the rotors. The device then moves the wiper along the rotors to release the adhering materials.