"Purex Fels-Naptha is a powerful laundry bar that works overtime to remove greasy, oily stains, perspiration, and ring-around-the-collar. With over 100 years of removing America s stains, you can rest assured that this laundry bar knows how to tackle your toughest stains. All you've got to do is rub the stain with a wet bar of Purex Fels-Naptha and let it sit for a few minutes. Then wash your clothes as you normally would and say farewell to tough stains for good.