a brush for use in an automatic brush cleaning apparatus having a carrier member adapted to releasably receive , support , and transport the brush through sequential cleaning stations . the brush includes a rigid back , a plurality of bristles projecting outwardly from one side of the back , and an elongated support block rigidly fixed to the other side of the back . the support block is formed with a longitudinal aperture having a non - circular cross sectional shape for receiving a generally complimentary shaped carrier member of the automatic apparatus such that upon positioning of the carrier member through the aperture the brush is supported in predetermined relation thereto and can be transported without relative rotational slippage .