There are several ways of cleansing it or anything really. Some common methord would be passing it through sage which I prefer. You can also dip it in holy water, moon water, or salt water. The thing is it should be dipped for thirty seconds or less because crystals can kind of desolve or erode from my understanding. It is also advised to wrap it in a cloth when not in use. You can also use just soap and water. There are some good cleansing soaps they sell with herbs in them in local metaphysics shops.Plain soap could also work of course. Spring water can also work and bay leaves are in some cases used for cleansing by burning it for miasma in Hellenic practice.