Some people use Borax for making homemade laundry soap, having the function of a laundry booster.
Homemade Soap - Lye Soap Recipe - How To Make Soap
What is organic soap made from? - Quora
Six Benefits of Adding Borax to Natural Laundry Soap – Goat Milk Stuff
Tallow Soap Recipe • The Prairie Homestead
Home Made Laundry Detergent / Soap - The Practical Pioneer
DIY Borax Crystals: How to Grow HUGE Borax Crystals
Homemade Laundry Soap {Borax Free!} – Practically Functional
Borax in Laundry Additives
Creative Soap Crafts - Pioneer Thinking
Homemade Soap - Lye Soap Recipe - How To Make Soap