Abstract: Disclosed herein is a brush for cleaning carpets which includes a base member by which the brush is secured to the underside of a rotary or oscillating machine to impart a corresponding movement to the brush; a plurality of bundles of bristles, each bundle extending from the underside of the base member and being spaced from adjacent bundles; and a plurality of freely rotatable spheres journaled in the underside of the base member and protruding therefrom to support the weight of the brush and machine and vibrate against the carpet as the brush is driven thereover.