On the topic of Paul's books relevance: I think he said it himself in one of his books; he just started in experimenting when there wasn't much info out there, and they're his anecdotal experiences put into books. Somewhat relevant, but not comprehensive and not near the relevance of the experience of the last 20 hears shared on the internet between good BPCR shooters. There's a lot better info out there now.
On cleaning the cases, I'm on the fence on that one.
A lot of guys decap their cases as soon as possible after firing, and put them in a jug of water at the range with some dish detergent in it. They let them soak on the way home, and then rinse and clean at home.
I just leave my cases as is and try to clean as soon as I can after I get home. If I leave them too long, they start to turn the inside of the case green and the resulting scale is harder to remove. But, if I do it within a day or so, they just clean out easily with water and detergent, followed by 30 minutes in the ultrasonic with a teaspoon of lemi-shine in the water.
If they get green on the inside, or the fouling doesn't rinse right off with water and detergent, I go to the nuclear option rather than mess around. I chuck a well fitting brass bore brush in a cordless drill, hold them underwater with the neck up, and run the brush in and out 5 to 8 times. That cleans them right out ready to go into the ultrasonic cleaner.
The reason I don't decap and store in water at the range is I have found it turns the cases a dark brown/black, and a mottled black finish remains even once I've cleaned in the ultrasonic. That doesn't happen fast, so if I rinse with detergent and hot water at home, it doesn't happen.
I tried cleaning with ceramic media for awhile, it did a great job but I found it belled in the mouth of the case slightly and made me have to run in an expander to easily seat bullets. Since I shoot all my brass with no neck tension, just slip fit the bullets in, that was an irritating extra step, so I went back to just using the ultrasonic and not worrying about getting them totally clean and shiny.
Here's my 45-90 cases cleaned that way and then polished in walnut shell for an hour or so in a dillon vibrating cleaner:
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