Wajh al-qurbah refers to using water with devotional intent, rather than solely to cool the body or remove ordinary dirt.
Thus, a person already in wudu who repeats wudu as an act of devotion differs from a person merely washing dirty hands. That distinction affects the classification of the water.
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Used Water: Definition, Ruling and Juristic Differences
Wajh al-qurbah refers to using water with devotional intent, rather than solely to cool the body or remove ordinary dirt.
Thus, a person already in wudu who repeats wudu as an act of devotion differs from a person merely washing dirty hands. That distinction affects the classification of the water.