(Sport Suds, for example, is so powerful that it supposedly dissolves the buildup on the inside of your washing machine. That means you have to pre-clean your machine to avoid getting all that smelly gunk re-deposited on your clothes—making it not ideal for anyone using a shared machine.)The first time I tried Nathan Sport-Wash, I tossed in three sets of rancid hot yoga clothes (including one outfit that another method had failed to get clean) and two sets of running clothes. Everything came out absolutely odor free, including those hard-to-destink leggings crotches. It even eradicated the baked-in stink on my running hoodie, which I thought was permanent.