Abstract: A method and apparatus for cleaning an internal surface such as a body cavity of a poultry carcass. In one embodiment, a manifold body is provided having a first axis therein, a first surface disposed about and centered on the first axis, and a first offset port having a principal axis orthogonal to, but offset from, the first axis of the manifold body. A central ring is disposed about the manifold body having a central axis aligned to the first axis of the manifold body, freely rotatable with respect to the manifold body about the central axis. A cap ring secures the central ring in place about the manifold body. A fluid is diverted through the offset port and against the inner surface of the central ring at an angle so as to impart rotary momentum to the central ring. At least a portion of the fluid passing through the offset port is directed across the fluid diversion surfaces so as to direct the portion of the fluid at the internal surface to be cleaned.