To dream of seeing shampooing going on, denotes that you will engage in undignified affairs to please others
To have your own head shampooed, you will soon make a secret trip, in which you will have much enjoyment, if you succeed in keeping the real purport from your family or friends.
To see or use shampoo in your dream, indicates that you need to clear out your old attitudes and old ways of thinking.
This dream often means that you need to take a different approach towards some real-life situation or relationship.
It can also mean you are doing this and moving on from something or someone that used to cause you trouble.