Dry Shampoo

I'm sorry if this is not the "right group" but it's the main one I post on. I was wondering how dry shampoo works, does it leave white powder on your hair ? and if anyone uses it ? I'm planning on buying some but want to get to know about it first, I will be watching YouTube videos later tonight. We all know as moms not all of us get to shower daily so i'm looking for a once in a while alternative.