Magnetic Decanter Dryer dries and polishes the insides of wine decanter, carafes and vases. Spot-Not decanter dryers consist of two main parts: an absorbent cloth that is inserted into the decanter and a drying mitt for the outside of the decanter. Both parts are made of highly absorbent microfiber material. The drying cloth for the inside of the decanter has a flexible core with two powerful magnets embedded in it. The drying mitt for the outside of the decanter also has a flexible core with two magnets. The inner drying cloth is attracted to the outer mitt, even through thick glass. As you move the mitt, the drying cloth also moves, drying and polishing the inside of the decanter.