Polishing the inside of FL sizing die

[kd4avp]

Came across a box full of various sizing dies at an estate sale.
Pretty nasty from years of storage in a garage in an open box.
Will run them thru my ultra sonic cleaner, but the insides of the dies need some love.
Flitz on a soft clean shotgun barrel mop on the end of my drill?

 

[Benchrest Braxton]

Came across a box full of various sizing dies at an estate sale.
Pretty nasty from years of storage in a garage in an open box.
Will run them thru my ultra sonic cleaner, but the insides of the dies need some love.
Flitz on a soft clean shotgun barrel mop on the end of my drill?

thats what i did on some of mine (flitz/shotgun mop/drill).

Never had any ill effects from polishing it with that and those dies have been very smooth for me resizing brass.