The soap nut is the fruit of the soap tree that belongs to the family of Sapindaceae, this fruit is extracted saponin (contained in the shell) valuable active substance in contact with washing water. The soap nuts can be used for all your laundry, nuts should be placed in a small bag or directly from your drum. White linen and persistent stains you can add 2 tablespoons of sodium percarbonate (salt whitening, stain remover and nontoxic). Nuts can also be used in your dishwasher.