When starting ablution(wudoo)
At the begining of making wudu recite:
بِسْمِ اللَّهِ الرَّحْمَنِ
الرَّحِيمِ
"I begin in the name of Allah, who is the Most Merciful, Most
Gracious".
It is stated in the hadith that one should begin wudhu with
Allah's name. No words have been specified and our elders read the above. It is
recorded in some ahadith that wudhu is valid although no "Bismillah" is
recited.
(Mishkat)
Source/By :
Fortification of the Muslims through remembrance and supplication from the Quran and the Sunnah