Abstract: A cleaning brush that is uniquely configured for removing lint, dust and other debris from an arcuate duct, such as an exhaust duct of a clothes dryer. The brush generally includes a body having an elongate arcuate shape, with a radius of curvature that is preferably greater than the length of the body. The body is formed of a flexible material so as to permit the brush to flex in the direction of the radius of curvature, which enables the brush to adapt to variations in the arcuate shapes of ducts. The brush is also provided with bristles that substantially cover one end of the body. The bristles include shorter, tightly-wound inner bristles and longer bristles that surround the inner bristles. As such, the brush is characterized by features that uniquely enable the brush to effectively remove lint and dust from along the entire length of a duct, yet enable the brush to flex sufficiently to accommodate variations in the arcuate shapes of ducts.