´It was narrated from Abu Hurairah that:` The Prophet relieved himself, then he cleaned himself (with water) from a pot made of brass, then he wiped his hand on the ground. Another chain with similar wording.
Maulana Ataullah Sajid
Commentary: Rubbing the hands on earth and then washing them results in greater cleanliness. Nowadays, using soap and similar substances for this purpose is also permissible; however, it is not obligatory. Simply washing the hands with water is also sufficient.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 358