Ushnan and soap are cleansing materials, but their mixture with water may have different outcomes.
A mild change that leaves the liquid recognisably water does not by itself prevent ritual purification.
A concentrated soap solution that is no longer unrestricted water is a different matter; dominance and the surviving water-character determine the distinction.
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Unrestricted Water, Restricted Liquids, and Clean Admixtures
Ushnan and soap are cleansing materials, but their mixture with water may have different outcomes.
A mild change that leaves the liquid recognisably water does not by itself prevent ritual purification.
A concentrated soap solution that is no longer unrestricted water is a different matter; dominance and the surviving water-character determine the distinction.