Abstract: An apparatus for cleaning hay and straw has a casing with a table and an inlet through which the hay and straw is fed. A set of tines (a rake) is positioned downstream from the inlet. A set of rotary tines is positioned to rotate through the rake to provide a combing and beating effect on the hay and straw fed thrugh the apparatus. Downstream of the tines is a chamber with a vacuum pump operatively connected to provide a suction through a perforate wall to remove spores and dust particles from the beaten and combed hay or straw. An outlet from the apparatus is located downstream from the vacuum chamber.