Sayyiduna Samurah bin Jundub (may Allah be pleased with him) said: the Messenger of Allah (peace and blessings be upon him) used to supplicate: "O Allah, put as much distance between me and my sins as You have put between the East and the West, and cleanse me of my faults as a white garment is cleansed of dirt."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6920