I used to lay a towel on top of our old electric hot-water heater, which was quite large and stood in its own alcove in my workshop.

When it started generously leaking onto the floor, we replaced it with an "outside-rated" one of more modest dimensions, so it is back to sun-drying on old towels spread out on the lawn.

Those Lyman pins are a great polishing aid, but they are expensive and get into odd places in the brass, (not so much with 9mm cases).

I bought one of those hand-cranked rotary media separators (the cheap blue one) to do a primary separation and "slow spin-dry". This gets most of the pins and water out. The next step is to use a fairly powerful old magnet from an expired loudspeaker driver to sweep up the ones among the dried cases on the towel.