…If you used a shampoo in a dream then such dream shows the thoughts which need to be cleared up. Consider to put some effort or change your attitude towards something. On the other hand the dream could indicate the good impression of the way you look and represent to others. Maybe you are trying to seduce someone and using the good looks as one of the tools….
Dream dictionary: Shampoo dream meanings
…Dreaming 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….