It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both), he says that the Prophet Muhammad (peace and blessings be upon him) intended to perform ablution from a waterskin. It was said to him that this is (a waterskin) made from the hide of a dead (animal). The Prophet (peace and blessings be upon him) said: "Its tanning removes its impurity, filth, and uncleanness."