I wash my brushes with warm water, shampoo first, rinse and then with hair conditioner and then you can shape them with your fingers and leave them dry by lying them flat over a towel until dry. NEVER dry them standing up, this is a no-no as they wont last.
If you use the brushes on yourself, to wash them once a week it's a good idea. But if you use the brushes in others, while at job you can just use a brush cleaner from Cinema Secrets, by pouring some of the solution in a glass or metalic jar, you dip the brush and then wipe it off on a paper towell, repeat it until you don't see any residues on the paper towell. At the end of the day, once you get home you need to wash them always. I put them on a cup with water and shampoo, leave them there for 10 mins and then rinse and put them on the cup with conditioner for another 5 mins. Then rinse and lay them flat to dry.
It's very important to keep your brushes always clean and sanitized so you don't contaminate anybody.