It’s soft water. Some cities or whole states have softer water than others. Louisiana comes to mind, the ground the water sifts through removes minerals. Others use water softening systems that removes the minerals from the water. Minerals that are left behind are what give you that squeaky clean feeling but can also cause dry skin and hair. Soft water that doesn’t leave those behind is said to be better for your skin. I notice my hair is less frizzy after taking a shower in soft water.
::edited for clarification
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