Besides doing a great job of washing Max's hair, baby shampoo is also great for washing makeup brushes, bras (and other hand wash delicates), and anything else that requires a gentle sudsing that you might be tempted to shell out big bucks to get special cleansers for. It's gentle, rinses clean, and it's cheap.
A time saving tip: wash bras while in the shower (not while wearing them of course), then flip them over the curtain rod to dry. Two minutes, tops. You're welcome.