I know this isn't an edible recipe but it's a recipe for homemade laundry soap. I used to make my own using a different recipe but wasn't very happy with the consistency. It was a little on the gloppy side. When perusing the Duggar's book I found a recipe there. I'm going to give it a try and thought I'd post the recipe here for you.
Homemade Laundry Soap
1 Fels Naptha soap bar, grated
1 cup washing soda
1/2 cup borax
Grate the soap bar into a small saucepan. Cover with hot water. Cook over medium-low heat, stirring continually, until the soap completely dissolves.
Put washing soda and borax in a 5-gallon bucket. Pour in the hot, melted soap mixture. Stir well, until all the powder is dissolved. Fill the bucket to the top with more hot tap water. Stir, cover securely, and let sit overnight. The next morning, stir the mixture. Mix equal amounts of soap concentrate and water in a small laundry-detergent dispenser or container. Shake before using.
For top-loading machines: Use 1 cup of the soap mixture per load.
For front-loading machines: Use 1/3 cup per load.