Invocation for leaving the restroom (bathroom/toilet)

"غُفْرَانَكَ".

11. Ghufraanaka

I seek Your forgiveness.

Reference: Abu Dawud, Ibn Majah and At-Tirmithi. An-Nasa'i recorded it in 'Amalul-Yawm wal-Laylah. Also see the checking of Ibn Al-Qayyim's Zadul-Ma'ad, 2/387.