One should recite the following Duaa upon completing his wudhu:
سُبْحَانَكَ اللهُمَّ وَبِحَمْدِكَ، أشْهَدُ أن لَّا إلهَ إلَّا أنْتَ، أَسْتَغْفِرُكَ وَأَتُوبُ إلَيك
Glory be to You, O Allah, with all Praise; I bear witness that there is none worthy of worship except You, I seek Your forgiveness and turn to You in repentance.…
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