Make-up brushes are a bit expensive so you really should know how to properly clean them. My fave make-up guru Michelle Phan has shared once before that the best way to wash you kabukis and other brushes is by dipping them in olive oil (I bought olive oil just for this reason) and soaking them in liquid soap (I use dishwashing liquid soap ;p) to remove all the dirt from the brushes. The soap, of course, cleans the brushes and the olive oil leaves the brushes soft.
But yeah, I am posting one other way of cleaning our brushes I found on Pinterest which is kinda similar to Michelle's way. See if this helps you ---
I hope it did! ;p