Before using the coffee grounds, make sure to dry the moisture-containing coffee grounds! If you don't dry it, it can easily get moldy or rotten. 1. Deodorization. Dehumidification.Air freshener Coffee bean scraps have odor-absorbing properties. Put them in unused baskets, bowls, socks, stockings, gauze, etc. and put them in refrigerators, shoe rack, trash can, vehicles, closets, etc If you put ..