If you want to take a bath, try this. Takes 5 min or less. There is a product used to give a "bed bath" invalids. It is essentiall a very large, thick , disposable "wet wipe". These can be bought at any pharmacy. Keep your hunting clothes in a bag or something. On the way or when you get to the woods, wash off with these and dress.

As far as getting in place an hour +/- before day break? I seldom do. I'd prefer head out so that I will be slipping in right at the very first light. I try to avoid using a flash light any more than necessary. If houwever I am toting in a climber, I get to my spot in time to be sitting still by sunrise.