I used to wash my hair twice a day because I work out every day (pre LHC) now I just do CO at night. I get pretty sweaty with my runs and need to do something. My DBF always tells me my hair smells great after that and doesn't look at all sweaty. If it's a "wear hair up" day, then I won't shower or shampoo in the AM - and my hair isn't greasy or oily at all the next day. And still smells pretty good. So far it's been working well.