A brush for use with a rotating motor device comprises a collar and a brush-head. The collar has a first open end and a second securing end. The securing end of the collar has a polygonal opening adapted for securely mating with a corresponding polygonal rotating shaft of a rotating motor device, such that when second end of the collar is secured to the rotating shaft, rotation of the shaft causes corresponding rotation of the collar. The brush-head comprises a plurality of bristles cylindrically bundled, said cylindrical bundle having a first fused end and a second loose end, wherein the bristles are securely fused to together at the fused end and the bristles are unattached to each other at the loose end, and the bristles at the loose end define a generally concave brush face wherein the bristles in the center portion are shorter than the bristles in the perimeter portion. The fused end of brush-head is adapted to slide snugly within the open end of the collar such that rotation of the collar causes corresponding rotation of the brush-head.