Duas, After Wuduu
Upon completing the ablution
أَشْهَدُ أَنْ لا إِلَـهَ إِلاّ اللهُ وَحْدَهُ لا شَريـكَ لَـهُ وَأَشْهَدُأَنَّ مُحَمّـداً عَبْـدُهُ وَرَسـولُـه
Transliteration
'Ash-hadu 'an lā 'ilāha 'illallāhu waḥdahu lā sharīka lahu wa 'ash-hadu 'anna Muḥammadan `abduhu wa Rasūluhu.
Translation
I bear witness that none has the right to be worshipped but Allah alone, Who has no partner; and I bear witness that Muhammad (swas) is His slave and His Messenger.
Reference
Muslim 1/209.
Upon completing the ablution
اللّهُـمَّ اجْعَلنـي مِنَ التَّـوّابينَ وَاجْعَـلْني مِنَ المتَطَهّـرين.
Transliteration
Allāhummaj`alnī minat-tawwābīna waj`alnī minal-mutaṭahhirīn.
Translation
O Allah, make me among those who turn to You in repentance, and make me among those who are purified.
Reference
At-Tirmidhi 1/78. See also Al-Albani, Sahih At- Tirmidhi 1/18