I use bars of soap.....box open and tucked between stacks of fab and also in linen closet between stacks of towels and bed linens and in lingerie drawer of dresser.......leave in for about a year, replace....with new. By opening the box the soap hardens and lasts longer when using.....learned that a long time ago from a scientist who was involved in making soap. He told us that soap used to be sold in just the bars but due to sanitary rules had to be boxed...just an idea......