The Messenger of Allah (May peace be upon him) used to wash his head with marsh-mallow while he was sexually defiled. It was sufficient for him and he did not pour water upon it.
Sunan Abi Dawud Book 1, Hadith 256
← Previous Hadith Shurayh ibn Ubayd said: Jubayr ibn Nufayr gave me a verdict about the bath because of sexual defilement that Thawban reported to them that they asked the Prophet (ﷺ) about it. He (the Prophet) replied: As regards man, he should undo the hair of his head and wash it until the water should reach the roots of the hair. But there is no harm if the woman does not undo it (her hair) and pour three handfuls of water over her head.

Sunan Abi Dawud Book 1, Hadith 255 Next Hadith → The Messenger of Allah (May peace be upon him) used to take a handful of water and pour it on the fluid. Again, he would take a handful of water and pour it over the fluid.

Sunan Abi Dawud Book 1, Hadith 257