Washing dirt from the hands of someone already in wudu is an ordinary cleaning act. Washing the limbs of someone lacking wudu may remove ritual impurity.
Physical filth and the legal state of hadath must be distinguished. Thus, not every drop of water used to remove ordinary dirt automatically carries the status of musta‘mal water.
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Used Water: Definition, Ruling and Juristic Differences
Washing dirt from the hands of someone already in wudu is an ordinary cleaning act. Washing the limbs of someone lacking wudu may remove ritual impurity.
Physical filth and the legal state of hadath must be distinguished. Thus, not every drop of water used to remove ordinary dirt automatically carries the status of musta‘mal water.