Instagram has just shown me someone using a salad spinner to wash their bras.
WHAT A TIME TO BE ALIVE.
However why stop there. You could wash yer smalls in one during a camping trip, much like using the spinner as portable.
Apparently, all you do is add warm water, a capful of your favoured washing liquid, and immerse your boulder holders. Spin for a bit, and then empty, add fresh water, and keep spinning until all the soapy water is out.
I'm going to buy a large salad spinner now.