The grays are multiplying and I'm currently trying out having my hair dyed on a regular basis. I don't want to wash my hair as often though in an effort to A) preserve the color and B) cut down on the amount of absurdly expensive shampoo I'm using. I'm trying to go three days between washing, but I'm a little hazy on the logistics...

How often do you wash your hair? Do you still get it wet in the shower? Do they make dry shampoo for dark hair? Do you wash your hair after working out?