Step 1
Lay a 10-inch square of thin fabric, such as cotton muslin, on your work surface. The fabric must have a loose weave, but not so loose that the moisture-absorber particles can fall through the fabric.
Step 2
Place ½ to ¾ cup of a desiccant in the center of the fabric square. For the desiccant, use silica crystals, available from craft stores, or activated alumina, available from industrial chemical suppliers.
Step 3
Gather the edges of the fabric together to form a bag securing the desiccant material inside. Tie the bag closed with a length of twine or a rubber band.
Step 4
Hang the bag from the closet rod. Alternatively, place the bag on the floor or on a shelf inside the closet.
Step 5
Open the bag and dry the desiccant crystals every two to four weeks, depending on how quickly they absorb moisture. Place the crystals on a baking sheet and dry them in a 300- to 350-degree F oven for two to three hours. Place them back in the bag and return them to the closet after drying.