Washing powder in bulk - November 2020- how to make washing powder for small business hand washing powder ,Explore 10 listings for Washing powder in bulk at best prices. The cheapest offer starts at R 80. Check it out!3 Ways to Make Your Own Laundry Detergent - wikiHowFeb 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.