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Great information about soap nuts
Ask the Garden Guy Introduces Soapberries to Hawaii.

...was the sapindaceae tree which produces berries that contain saponin, a natural detergent that both cleans and softens clothes just like store bought laundry detergent.  Commonly called Soap Nuts, these berries grow in warm subtropical regions and are gentle on both clothing and skin. Soap Nuts are bio-degradable, anti-bacterical, and non-toxic.  They can be used over and over and still produce soap!  Soap Nuts are perfect for high efficiency machines too because they are low sudsing. Loads of Love, Inc. imports Soap Nuts from the himayalan mountains of India to the United States, where they are then packaged by Loads of Love, Inc.....Read More

Simply put 6 soap nuts in the cloth bag, put the bag in the washing machine, and launder as usual. Each bag cleans at least 3 loads of clothing.