Upon completing Wudhu

اللّهُـمَّ اجْعَلنـي مِنَ التَّـوّابينَ وَاجْعَـلْني مِنَ المتَطَهّـرين.Allahummaj-AAalnee minat-tawwabeena wajAAalnee minal-mutatahhireen.O Allah, make me of those who return to You often in repentance and make me of those who remain clean and pure.’[At-Tirmidhee]