The Prophet ﷺ used to wash his head with marshmallow plant while in a state of major ritual impurity, considering that sufficient without pouring water over it.
حدثنا محمد بن جعفر بن زياد حدثنا شريك عن قيس بن وهب عن رجل من بني سواءة بن عامر
عن النبي ﷺ أنه كان يغسل رأسه بالخطمي وهو جنب يجتزئ بذلك ولا يصب عليه الماء
No references are available.
[Its chain of transmission is daif] Bayhaqi 1/182 narrated it from the hadith of Abu Dawud through this chain * A man from Banu Suwaah is majhul (unknown), as stated in Taqrib and elsewhere.