Cleansing your hair during hiking and camping trips is necessary if you hair becomes messy, oily, and smelly by the third day of the trip. Your companion may not be so fussy, but you probably won’t feel right about going without washing your hair for so many days. Of course it may not be easy if you have no access to running water, so pack a bottle of dry shampoo as one of your camping supplies.
Most dry shampoo products for hiking and camping are in liquid form and are in fact too wet to dry out in a short period of time. It is not rational to use WET dry shampoo that cannot dry out easily, because the outdoor environment can be much colder and of course has no electricity provided for a hair dryer at all.
See here how troublesome it be when you need to wash your hair outdoors: Camping for Women.
Fortunately, the high technology of Fáciaño Dry Shampoo can solve your problem.