Eraser - Hmmmm New one... Is that filling the grain and removing grit at the same time, or did you make mistake and fixing themIn the lathe,I go over really dirty shafts with a Magic Eraser and some kind of household cleaner,like Awesome Orange,etc.
After that,I use a clean part of the Eraser,turn the lathe off,and go with the grain.
I wait a minute for the surface to dry,and inspect the surface,then move into light sanding,unless the customer says not to.
My own shafts NEVER get to the point where I can't use just denatured alcohol and the Eraser,600-1000 grit paper,then reseal and buff. Tommy D.