This device is a more gentle version of my old back scrubber, the angle grinder with a wire cup brush attached and bolted to the bathroom wall, upon which one gyrated ones back. This was a little aggressive if one had a tender back. I heard rumours of folk emerging from their bathroom in pain, looking like a skinless sausage, all covered in blood. This version is non mechanical, very simple to make non aggressive and quite gentle to use. All that's required is a flat stick about 2' long by an inch wide, two of those small dual cleaning sponges, the ones with a green scourer on one side and sponge on the other and glue. Stick one sponge sponge side outwards to one end of the stick and another scourer side outwards on the other side of the stick, adjacent to the first one. That's it folks. Let the glue set and its ready for use. Scrub, with soap and water your back firstly with the scourer side to remove ingrained muck, finishing off with the sponge side for a lovely deep sheen and supple finish. No more rubbing itchy backs up and down on door posts.