This is one of the most beautiful duah I've ever come across

"اللَّهُمَّ بَاعِدْ بَيْنِي وَبَيْنَ خَطَايَايَ كَمَا بَاعَدْتَ بَيْنَ الْمَشْرِقِ وَالْمَغْرِبِ، اللَّهُمَّ نَقِّنِي مِنْ خَطَايَايَ، كَمَا يُنَقَّى الثَّوْبُ الْأَ بْيَضُ مِنَ الدَّنَسِ، اللَّهُمَّ اغْسِلْنِي مِنْ خَطَايَايَ بِالثَّلْجِ وّالْمَاءِ وَالْبَرَدِ"

O Allah , separate me from my sins as You have separated the East from the West. O Allah, cleanse me of my transgressions as the white garment is cleansed of stains . O Allah , wash away my sins with ice and water and frost.

ahh the magic of understanding arabic, Its beautiful understanding what you recite or read of duahs/surahs in your prayer!

(Reference:Al-Bukhari 1/181, Muslim 1/419. )

there's also

سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ، وَتَبَارَكَ اسْمُكَ، وَتَعَالَى جَدُّكَ، وَلَا إِلَهَ غَيْرُكَ

Glory is to You O Allah, and praise. Blessed is Your Name and Exalted is Your Majesty. There is none worthy of worship but You.

(Reference:Abu Dawud, Ibn Majah, An-Nasa'i, At-Tirmithi. See Al-Albani, Sahih At-Tirmithi 1/77 and Sahih Ibn Majah 1/135. )

there are a lot more duahs to be learnt. [sigh]

May Allah guide us, help us on the right path. This is just a little reminder. for me primarily.