Best way to clean shaving brushes?

It's not dirt so much as the residue from all that soap! I think they benefit from a good clean every once in a while.
Defo. I think the main thing is to use water that is not so hot that either damages the hair or the knot glue.

Hot enough to break down oils, residue etc though. I’ve never thought of conditioning the other people do that?
So I followed the 3 stage method suggested in the video link above and the brushes have come out looking like new.

Just soaked them in warm water with a little washing up liquid, followed by a soak with some glycerin based face wash and finally some conditioner.

Worked for me!