How To Make & Use Homemade Powder Soap Nuts Laundry Detergent- powder washing soap powder washing soap laundry powder detergent powder ,Homemade Powdered Soap Nut Laundry Detergent. The first time I ever used soap nuts for laundry detergent I was blown away. Then I learned you can also powder soap nuts to use as a homemade laundry detergent and my mind was blown again! There is a small inconvenience to using soap …Why you should always use liquid detergent - CNETPowder can also leave chunks of undissolved detergent in your washing machine parts. As you can imagine, this can lead to malfunctions. It particularly affects the washer's drainage system.