171. Upon completing the ablution #2

اَللَّهُمَّ اجْعَلْنِيْ مِنَ التَّوَّابِيْنَ وَاجْعَلْنِي مِنَ الْمُتَطَهِّرِيْنَ

Allaahummaj'alnee minat-tawwaabeena waj'alnee minal-mutatahhireen

It has been narrated in Sahih Hadith that the dua should be recited after the previous dhikr. The eight gates of Paradise will be opened for the one who recites these two duas; He will enter (Paradise) through whichever door he wishes.