Fabric Softener Scent Lasts Longest . A simple product without additives that can irritate skin. If i wash bedding and then put it away, it still smells. Downy Fabric Softener, Ultra, Scent Pearls, April Fresh, 129 fl oz (1 from www.kmart.com Which fabric softener scent lasts the longest? Preferred by longtime users of other popular brands. Heaven knows what they have added to make the smell last a long time.