No problems . . . 'Easy Peezy'
https://i.imgur.com/kIuTEEEl.jpg
https://i.imgur.com/loxCDK2l.jpg
Make a hammock out of a large bath towel, dump your brass in the middle and then grab both ends of the towel and work them back and forth making the brass tumble in the towel from side to side...the 'wash & wax' makes the brass shed any water whether inside or out and the towel pulls it away...
Lay the towel out in the Good'ole sunshine that dries the brass in less than an hour.
https://i.imgur.com/LO96VLbl.jpg
Use your magnet to pick up the spilled SS-pins...pins that might have stayed in a case will be in the dark colored towel and you can retrieve them there.