The Messenger of Allah ﷺ said to them regarding the washing of his daughter, "Begin with her right side and the parts of her body washed in ablution."
حدثنا أبو كامل حدثنا إسمعيل حدثنا خالد عن حفصة بنت سيرين
أن رسول الله ﷺ قال لهن في غسل ابنته ابدأن بميامنها ومواضع الوضوء منها
Reported by Bukhari in the chapter on wudu, section on starting from the right in wudu and ghusl, hadith no. 167, and Muslim in the chapter on funerals, section on washing the deceased, hadith no. 43/939, from the hadith of Ismail bin Ulaya, through this same chain.