Stiff bristle or soft? White plastisol is a bear to get miscified (I made that up).
Medium
No dip tanks here (though I wouldn't mind them)
I clean ink with press wash and paper towels, (If you soak in a tank, and/or use a water soluble ink degrader, a medium brush would be good here as well.
I then use a pretty stiff brush after I soften emulsion by spraying with remover.
I then use my medium brush for degreaser, or ReNuit de-hazer,