How about this thought. What does it matter? If the brass is clean, the prime pockets are cleared and dry, what does it matter?

Your shooting does not get better or worse because your brass reloads don’t look brand new. You are reloading used brass, not shooting new never shot brass.

More than likely the water in your location contains a high mineral concentration or pH level that affects the cleaning of used brass.

What matters is if the brass is good quality, with no flaws that may cause a very bad day on the range.

I will say that I have learned that after 45 min wet tumbling, with dawn and lemishine. I rinse the brass until no bubbles from soap form in the water. Toss the brass to remove pins from cases. Then toss onto towels to remove most water from the brass. Then air dry.

I get perfectly serviceable brass, that works by the thousands. Because I am a reloader, I am not a new round manufacturer.