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My brass is deprimed and tumbled and very clean before it gets to my sizing die. After use I will run a patch through with CLP on it. It serves to remove any residue from the die and put a protective coating on the internals of the die. I now live in a very dry area, so external rust is no longer an issue.
A quick way to determine if you need to clean your die is to just pull it apart after sizing a batch of brass. Run a clean dry patch through the die on a brass jag, and check the patch. It will tell you more about what cleaning is necessary than anyone can.
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