I'm just about to head out the door for a haircut.
I was doing a letter-box drop of shampoo sample bottles a few years ago. A friend of mine is in the area, he saw me out the front and we talked about it all, we were joking that he'd be good for a shampoo commercial ( he's got long straight hair + beard + deep voice )
The excess bottles left over, I used, they lasted more then 6 months. Happy with that.