Fels-Naptha 5 Oz. Laundry Soap Bar. Pack of 5. Heavy-duty laundry bar soap. Used for pretreating greasy, oily stains like perspiration stains and ring-around-the-collar. It is an effective soil and stain remover. Ideal for prewash spotting. 1 of a kind product - nothing else like it. It can be used for general, garden, laundry uses, and treatment for poison ivy. 5 Oz. bar.