Mark, the Walker Audio brushes do have a directional nap to the fibers. The pads are replaceable, without using any adhesives. While I do orient the brush nap against the rotation of the record when spreading fluids, I scrub back and forth without difficulty just as with the Disc Doctor brushes.
Curious about the Walker Brushes, are they just one-way directional, ala vintage Discwasher Brush, or can one scrub in both directions without a need to rotate the Brush?