On one of Schmecky's polishing threads, he shows in detail the easiest way to polish hard to reach places using a Dremel tool.
There is a 1/8" Dremel "stem/shaft"for sanding and polishing that has a tiny screw in the end to hold the tools it uses.
THAT shaft with the screw removed, and a thin strip of sandpaper wrapped over the end and down the sides uses a small O-ring used as a rubber band over the strip of paper to hold it in place. He also shows all the locations to polish.
A number of members here have used his method