The directions with Simpson brushes state: "leave in open air to dry out, never enclose a damp brush." Just wondering if this means your medicine cabinet?
long as u leave it cracked open, why not? personally i think its best in the open due to the fact that the humidity is gone quicker- cleaner and more sanitary
I shook mine dry, wiped it gently on a towel a few times, then stowed away in the ol med cabinet with both badgers and boars.....Of course, my med cabinet has an open gap between the mirror glass door, and the frame all the way aaround, as to allow for airflow I believe......I always set mine near a gapped side, and it was always dry in the morning for me, just dont put i away overally wet IMO and you will be fine.