DUA FOR WUDU (BEFORE WUDU AND AFTER WUDU)
Before wudu, you should say Bismillah. After wudu, you can say this du`a, “Ashhadu an la ilaha ill-allah wahdahu la sharika lah, wa ashhadu anna Muhammadan ‘abduhu wa rasuluhu.”
Dua Before Wudu
بِسْمِ اللهِ
Translation – In the Name of Allah.
With regard to what is to be said at the beginning, the only thing that has been narrated is to mention the name of Allah by saying Bismillah (in the name of Allah).
The evidence for that is the words of the Prophet (peace and blessings of Allah be upon him): “There is no wudu for one who does not mention the name of Allah in it.” Narrated by al-Tirmidhi, 25. He said: Concerning this topic it was narrated from ‘Aishah, Abu Sa’id, Abu Hurayrah, Sahl ibn Sa’d and Anas. Ahmad ibn Hanbal said: I do not know of any hadith with a jayyid isnad on the topic. (Al-Tirmidhi)
DUA AFTER LEAVING THE BATHROOM
Dua After Wudu
أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ
Ash-hadu ‘an laa ‘ilaaha ‘illallaahu wahdahu laa shareeka lahu wa ‘ash-hadu ‘anna Muhammadan ‘abduhu wa Rasooluhu.
English 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 is His slave and His Messenger.”
Narrated Hadrat Umar ibn Al-Khattab (RA). He heard the Prophet Muhammad (PBUH) say,
“None of you makes wudu and completes the wudu, then says: I bear witness that none has the right to be worshipped except Allah Alone, He has no partners; and I bear witness that Muhammad is his Messenger, except that all eight Gates of Paradise are opened for him, so he may enter by whichever he pleases.” [source]