Is anyone polishing their sizing dies? After using awhile steel sizing dies causes resized cartridge cases show small sleeks, even when the brass is thoughly cleaned. I suspect primer powder residue build up and becomes imbedded in the die...the material is abrasive and is probably powdered glass (silicon-dioxide). It cannot be removed with a tight fitting patch with a solvent. Rubbing the sized brass with fine steel wool will remove the sleeks; as will cleaning with SS pins. Was wondering what others use to polish theirs....