I used to do the same thing when I was shooting matches.
Pros are also looking for absolute consistency from round to round and depending on the venue, some of them refuse to load their ammunition until they get to the match, into cartridges with turned necks, to fit the custom chambers of their rifles, with "undersize necks.
Again depending on the venue, the dies, often Wilson, such as your own, will have interchangeable neck sizing "bushings"
Clean depends on how "anal" you insist on being.
When I was match shooting, I used a bore brush to aggressively clean the inside of the necks, using Hoppe's carbon solvent, on a patched jag to wipe it out afterwards.
I'm not that anal with my hunting rounds.
I use a bore brush to clear away the crud, you can't clean burnt powder stains without polishing.
I have never had an issue with the bullets I handload, welding themselves to the case necks. But then, I usually use up all of the ammo in a short amount of time, less than a year.
I have had serious issues with "surplus" ammunition, and even some commercial ammunition, which I've picked up from estate sales.