Many of us add liquid fabric softener to the washing machine to help make clothing not only feel soft, but smell good, too. But the nonprofit Healthy Child Healthy World says it’s best to skip fabric softener; in addition to the artificial fragrance used in most softener, it also leaves a film behind on fabric fibers. All of this can cause skin irritation and trigger allergies. Softeners can also build up in the washing machine, staining future loads of laundry. Avoid it altogether, and stick with good old white vinegar to soften your clothing naturally.