Du'a upon leaving the restroom

غُفْرَانَكَ، الْحَمْدُ للهِ الَّذِي أَذْهَبَ عَنِّي الْأَذَى وَعَافَانِي

Ghufranaka, alhamdu lillahil-ladhi adh-haba 'annil-adha wa 'afani

I seek Your pardon. Praise be to Allah Who removed from me discomfort and gave me relief.

Sunan Abī Dāwūd 30 for "Ghufrānaka"; the rest is from Sunan Ibn Mājah 301.