After seeing my cats repeatedly rubbing against wire shelving,
I was determined to find some kind of brush material to make it more enjoyable.
This is part of (another instructable for) our 150-foot cat walk run WIRE SHELF ENCLOSURE. Please click on my photo icon to see links or see photo below to get the full picture. The cats are safe inside from basement to utility room to garage and in warm weather they will have access to a caged in porch outdoors. https://www.instructables.com/id/Cat-enclosure-with-high-cat-walktunnel-utilizes-/
After a visit to the dollar store, I filled scrubber brushes with catnip (where liquid soap would be held) and rubbed catnip on the bristles. From there I attached the brushes in various areas on the wire shelving with cable ties. Remember to trim ties for safety.
I also have extra scrubbers to give them a "brush" once in awhile in passing.
Please see the photos and videos which should illustrate purring, rubbing and general content.
Green brush-like Christmas tree branches would fit very well into my wire shelving units that keep my cats safe from the outdoor coyotes. They would add some greenery to the room which might be pleasing.
Thanks for viewing my instructable.
May more and more cats find good homes which make people AND cats happy.
Below is spare brush used manually.