I say, and with God's help: It becomes valid for ablution; because the condition is that water reaches the parts of ablution, whether it is intended for purification or not, and this has been achieved. The intention in ablution is a Sunnah and is not a condition for the validity of the ablution, so the validity of the ablution does not depend on the intention; because the nature of water is to remove and purify, and using it necessitates the attainment of purity even in the absence of intention. See: Sharh al-Wiqayah p. 82-83, and Fath Bab al-Inayah 1: 55, and God knows best.