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? Is there a transition period associated with shampoo bars? Can children use the shampoo bar? Does a shampoo bar work as well as liquid shampoo? What hair types is the shampoo bar suitable for?