Then pour the brass onto a towel. Let it dry for a while. If you put it out in the sun they will dry faster.
Now that part of the process, I'm kinda picky about. I couldn't just leave them in the sun for awhile and trust that they would be dry inside. A 200 degree oven will vaporize any moisture, and isn't hot enough to harm the metal.
Birchwood Casey does have a liquid case cleaner that works pretty well. It's got some kind of mild acid in it -- phosphoric, acetic, licergic, --- I can't remember.