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Actually, I do polish new dies. I use Flitz on a bore mop or patches wrapped around an old worn brush. (I keep old brushes just for that reason.)
You can also use JB Paste or jeweler's rouge, but I'd avoid anything more aggressive like lapping compound or auto rubbing compound.
Give them a good squirt of brake cleaner to remove all the paste and then a very thin wipe of rust preventative. Allow to dry before you use them.
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