Sunnah al-Fitr

"The Sunnah of Al-Fitr consists of three things:

Walking to the prayer place (musalla), eating before leaving (for the prayer), and taking a full bath."

[Al-Firyaabi, Ahkam al-'Eidayn. Shaykh al-Albaani graded its chain of transmission sahih in Irwaa al-Ghalil 3:104] via sayingsofsalaf.net