Sunan An-Nasai, Chapter: The Book of Ghusl and Tayammum

"A woman asked the Prophet (saw): 'O Messenger of Allah, how should I perform Ghusl when I become pure?' He said: 'Take a piece of cotton wool scented with musk and clean yourself with it.' She said: 'How should I clean myself with it?' He said: 'Clean yourself with it.' She said: 'How should I clean myself with it?' The Messenger of Allah (saw) said: 'Subhan Allah!' and turned away from her." Aishah understood what the Messenger of Allah (saw) meant, and said: "So I pulled her toward me and told her what the Messenger of Allah (saw) meant." (Sahih)