This is driving me nuts! I'm still happy with my hair at the end of day 2, but my scalp is too oily to not wash. It's particularly noticeable at the front. By the middle of day 2, it just looks ew in that area! I tried two waterless shampoos without success. Any ideas to help prolong the time between shampoos? I try to wet my hair as infrequently as possible because it takes forever to dry!