I’ve seen recipes before and have been planning to make some, but this is the first recipe with vinegar. Do you know what function the vinegar serves? I always have gallons of white vinegar on hand for various purposes.
I think the white vinegar is a substitute for fabric softener.
Fabric softener is supposed to weaken the threads of your clothes and thus make tham less sustainable....vinegar is supposed to make that problem obsolete and it does not make your clothes smell like vinegar instead of Bounce! It just makes them happy clothes!.
http://www.sistersshoppingonashoestring.com/easiest-diy-laundry-soap-recipe-ever
The recipe I use. Have made it for most of my friends and family too.