Bought a dedicated de-priming die with my 1st set of dies: use them to de-prime and, then, thoroughly clean (tumbled with SS pins) all cases before they ever go through the sizing dies.
The sizing dies all look like new.
A shot of Hornady One Shot Gun Cleaner, a few Q-Tips every so often (especially after loading a bunch of lead or coated bullets) keeps the dies functioning as new. At some point I guess I will eventually get anal-retentive and run them through the sonic cleaner...
Cheers!
P.S. I wonder how many actually perform the most basic of all die maintenance: as recommended, thoroughly cleaning them before using them the 1st time?