Use a Q-tip as the tool, thread the stick end through the bushing and pull the cotton fuzz into place. It doesn't take too long, so low speed on the dremel for a couple minutes or so is all I usually do.
Some people use toothpaste, not the gel kind, but like the old Crest paste. It has just enough fine abrasives in it, and it's easy to clean up. I use Mother's mag wheel polish I had laying around.
I also take the bushings out and use 2000 grit sandpaper on the face of the bushing where the shims ride. The face isn't usually too smooth to start.
Hope this helps.