Abu Abd al-Rahman bin Abdullah said that he heard Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) asking Sayyiduna Bilal (may Allah be pleased with him): How did the Messenger of Allah (peace and blessings be upon him) wipe over the leather socks? He said: "He (peace and blessings be upon him) would go out to relieve himself, then call for a vessel of water, wash his face and hands, then wipe over his leather socks and over his turban."
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1095
Abu Abd al-Rahman said: I was with Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) when Bilal (may Allah be pleased with him) passed by, and the people asked him about the ablution of the Messenger of Allah (peace and blessings be upon him). He said: "He (peace and blessings be upon him) would relieve himself, then come and perform ablution, and wipe over the turban and the leather socks."
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1096
Abu Abd al-Rahman narrates a similar hadith from Sayyiduna Bilal (may Allah be pleased with him), and he from the Prophet (peace and blessings be upon him).
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1097