'Abdur-Rahman bin Hurmuz Al-A'raj said:
"Na'im the freed slave of Umm Salamah narrated to me that Umm Salamah was asked: 'Can a woman perform Ghusl with a man?' She said: 'Yes, if she is well-mannered.[1] I remember the Messenger of Allah (ﷺ) and I performing Ghusl from a single wash tub. We would pour water on our hands until they were clean then pour water over them.'" Al-A'raj said: "Not mentioning the private area not paying attention to it."

[1] Kaiysah:" Well-mannered when using the water with the man" (An-Nihayah) And the comments by Al-A'raj after the narration refer to its meaning.