18ozcontainer Purex Crystals or Downy Unstoppables
Instructions
Grate the bar of Fels Naphtha soap. I like to use the fine grater to grate the soap. The smaller the pieces the easier it is to distribute through the laundry detergent.
In a large bowl, mix the grated bar soap with the washing soda, crystals, and borax. Use a whisk to mix them well.