I know what you mean -- there is no way that I will be able to shampoo my hair after every workout (I have super curly hair that takes forever to blow dry to tame down so it's presentable!). I will be putting it up until the last workout on Saturday and THEN shampoo it really, REALLY well (which it will need!).
I will probably use the baby wipe suggestion (they are on my list of things to bring!).
Julie