Dr. Bronner’s Pure Castile Soap claims 18 cleaning uses in one bottle. One of those is laundry soap. Want to know how to make your own using only a cup of Dr. Bronner’s per 64 loads? Check it out: This laundry soap doesn’t create suds, but it doesn’t need to in order to get your laundry clean. 1 cup Dr. Bronner’s pure castile liquid soap1 cup baking soda2 cups water1/3 cup salt Warm the water and mix with salt and baking soda until dissolved.