Will the shampoo bar leave waxy residue? 16 January 2023 18:38 Updated No, the shampoo will not leave waxy residue or build up on your scalp. Related articles Will you have a conditioner bar? Will I need to wash my hair more frequently with a shampoo bar? Is there a transition period associated with shampoo bars? What ingredients are in the shampoo bar? Where are the shampoo bars manufactured?