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3 Ways to Make Your Own Laundry Detergent - wikiHow- how to make washing powder washing soap powder blue powder bleach ,Feb 28, 2020·To make your own powdered laundry detergent, grate 10 ounces (283 g) of bar soap, like castile or Zote laundry soap, over a large bowl with a cheese grater. Transfer the soap flakes to a food processor and pulse the soap for 1-2 minutes until the flakes have been reduced to a powder.10 Unexpected Uses for Laundry DetergentJul 07, 2015·Instead, make yourself a scum fighter with a mixture of powdered laundry detergent and water. You don't need to add much liquid; just enough to work the powder into a spreadable thick paste.