Will I need to wash my hair more frequently with a shampoo bar? 16 January 2023 18:38 Updated No. Most people find that they can wash their hair as often as they used to with liquid shampoo. Related articles Will you have a conditioner bar? Will the shampoo bar leave waxy residue? Does a shampoo bar work as well as liquid shampoo? What hair types is the shampoo bar suitable for? Are the shampoo bars suitable for nut allergy sufferers?