To prevent moths from ruining your wool blankets, make sure your place of storage is completely clean. Move things around often so moths don’t have any place to settle. You might even want to consider an airtight bag for your blankets. And wash your wool blankets well before you store them, along with any other clothing or bedding items you keep them with. Moths are attracted to things like sweat and food crumbs, so storing dirty bedding can draw the pests in.