How To Use Shampoo Bar In Hard Water Uk. A sodium bicarbonate (baking soda) solution can be used to rid your hair of the. All liquid shampoo contains a surfactant.
All of these solutions, soften the water chemically. And then after washing twice with the shampoo bar use more bicarb in your final rinse.
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Another little trick is to add a pinch of baking soda to a quart of warm water. Don’t rub the shampoo bar directly onto your head and hair.