This was happening to me a few months back and I posted a thread here http://thefiringline.com/forums/show...ight=scratches
. I got alot of advice about polishing and the likes, but one fella suggested I give the die a good cleaning with some copper solvent.
Since this approach seemed the least labor intensive, I tried it. Guess what? Yep, Problem solved!
Before you do anything else, take your die apart and give it a really, really good scrubbing with some sort of bore solvent. Let it dry, relube it and see if that fixes your problem. If so, no need for polishing! Yeah!
P.S. How do you find the thread ID # to link a thread with HTML code in TFL?