In the meantime, thanks to Mommy's Kitchen for picture and recipe. I don't know if I'll try that or the Duggar's dry detergent concoction.
Dry Detergent From Mommy's Kitchen
2 - Cups Laundry Soap Shavings (1 bar)
1 - Cup Mule Team Borax
1 - Cup Arm & Hammer Washing Soda
Grate soap using cheese grater. Combine all ingredients in a bowl and stir well. Place in sealed container or tub and measure out two tablespoons (or 1/8 cup) for each load.
Powdered Laundry Detergent From the Duggars
*Uses 1/2 not 1 c of borax