Abstract: The invention, in a first aspect is a multi-piece rotor for use in a chemical spray cleaner. The rotor comprises a top plate, a bottom plate, a plurality of struts, and a pair of retainer bars. The top plate defining an aperture keyed to a wafer cassette. The bottom plate includes an interior surface on which the wafer cassette may bottom and an exterior surface defining an aperture for receiving a rotating shaft. The struts separate the top and bottom plates, each strut fastened at a top end thereof to the top plate and at a bottom end to the bottom plate. The retaining bars fasten to adjacent ones of the struts on the radially proximal surface thereof. In a second aspect, the invention is a rotor constructed from polyphenelyne sulfide for use in a chemical spray cleaner.