I have never heard of the alcohol thing, but I don't think I would try it. Once the tumbling is done, I just run water into the drum until it is clean...cold water btw.
If I have hundreds of small pistol brass like 9mm, I just toss them into a strainer with larger holes and toss it like I'm flipping pancakes. Otherwise, I just turn them upside down in the water and pull them out..pins fall right out. This way, I also see if there are any pins stuck in flash holes, but that does not happen often. 223 brass cases seems to fill on occasion though and so you have to keep an eye out for that if you're doing that caliber.
If you are constantly doing large amounts of pistol brass, I would invest in a media separator. I'm sure they don't cost that much,
As for drying, it's like I said. I just lay them on a towel on their sides and drop a reptile lamp with a regular bulb to about a foot over the brass and they are dry in no time. If you are in that much of a hurry to load your brass, start tumbling sooner....