Physics of Hair-Washing

My daughter's hair is - curly - to say the least. It's wild, it's insane, it has a complete mind of it's own (and for that matter, a life of it's own - I think it's sneaking out and partying all night). So the quantum of time and energy and baby shampoo it takes to actually wash her hair brings us to only accomplishing this act about twice a week. She's grown accustomed to me scrubbing her scalp like a frantic housewife cleaning before the husband's boss comes for dinner and will most likely grow up to retell these harrowing accounts in a memoir about how her mother was always her biggest inspiration and also ruined her post-puberty life. In the meantime, however, this twice-a-week ritual can be religiously detailed into three parts not including minute details in between: a) the initial donning of the bubbles, b) the scrub-for-your-life, mold into a silly hairstyle & pose and finally c) rinse and do the "shirley temple shake". Oh, and she still loves me after it's all over....