Laundry Soap (Powder)

I've been making this for years.  I use 2 TBSP per load of laundry, which costs $0.09.  

Ingredients

• 1 bar of soap (use any variety that is flaky and easy to grate)
• 1 cup of borax
• ​1 cup of washing soda (not baking soda!)

Instructions

1. Grate the bar of soap. 

2. Add the soap, washing soda and borax to an air-tight container.

3.  In a day or two, once the soap flakes have become dry and brittle, blend the whole mixture in a blender or food processor.  If you skip the blending step, the soap flakes tend to clump together in the wash instead of dissolving. 
Tip: Do the blending step outside if you can.  The powder gets in the air, and it hurts your lungs.  

cost per batch (2 cups)
bar of soap:  $0.40 (I bought a 10-pack of Ivory soap at Target for $3.99.)
borax:  $0.34
washing soda:  $0.70
total cost per batch:  $1.44
total cost per load of laundry (2 TBSP powder):  $0.09

​For comparison, I read that the average cost of laundry detergent per load is $0.21.
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