walleyeyeman used Mothers to polish his metal/inlace acrylic brush handles, however I believe he polished them on his engine lathe. Maybe an extra pair of hands and the 'shoeshine' buffing with a rag?
I've cleaned my walleyeyeman brush by just by rubbing it with the mothers and an old tshirt but it never needs much help.
EDIT:
I use my hand to hold the badger hair tight and wrap the hair at the base where they meet the handles with the blue painting tape. This keeps the Mothers off of the hair.
Here is one of his brushes right off of the lathe:
Attachment 275239