Use this shampoo on the child’s hair at least twice or thrice in 7 days. Hard water also contains chlorine, which is harsh for your skin and hair. If you remove your shower head from its mount or pipe, such as with a handheld shower head or by twisting the shower head counterclockwise, you can also fully submerge it in a bowl with the Dr. Bronner’s soap and water instead of securing a plastic bag around it.