L.M.
My grandmother-in-law gave me a bar of Fels-Naptha right after my husband and I got married five years ago. (I am about to open my second bar.) I keep it in a jar with water. Most times I just need to use the water. For tough stains, I use a little of the bar and rub it into the stain. Some stains take a bit of elbow grease, but it has saved many baby clothes from diaper explosions.