Scratch bed: the ultimate back scratcher

This is an idea for a spa/therapy type experience: a vibrating bed of bristles that you lie on. I would imagine that it would stimulate blood flow to the skin and would be effective to exfoliation. It might be necessary to separately vibrate each clump of bristles rather than have the bed as a whole vibrate otherwise relative movement might not be achieved. The bristles would need to be washable (e.g. nylon) so that the bed can be hosed down with warm soapy water between uses (for hygiene purposes). A hole in the table for the face like a massage table would enable people to lie face down.