Does Laundry Detergent Expire? - The Spruce
Homemade liquid laundry detergent can develop mold and mildew growth because it does not contain any bacteria inhibitors. Homemade products should be stored in a climate-controlled area to lessen the growth of mold. Dispose of any mildew-infested product and only make batches that are small enough that you can use them up within two months.