Tom, You would use an HO tool on S??? Blasphemy! Interesting though, that the HO trucks need "reconditioning" enough to have this tool made available--so there must be some wear involved. It would be interesting to see if anyone has studied use and rolling ability degradation over time of use.
Of course, if you're not running your trains on the floor, the hair, etc. build-up should be less frequent (unless your cat sleeps on the layout!).