Step 1

Powder the entire 5.5-ounce bar of Fels Naptha finely using a food processor (can use a cheese grater on finest grate)

Step 2

In a container that has a tight-fitting lid, combine the powdered Fels Naptha, 2 cups of washing soda and 2 cups of Borax. Shake to mix well. Store in a sealed container that is properly labeled. Use 1 to 2 tablespoons per load.