Apparently it is very easy to make and only costs 28 cents a load. Just two ingredients plus hot water. I have yet to try it but she says it is wonderful. It smells good and works like a charm at getting clothes clean. Here is the recipe:
4 cups hot water
1 bar fels-naptha soap shredded (see picture above for this soap)
Heat and melt in large pot
1 cup arm and hammer "Super Washing Soda"
3 gallons hot water
Mix all ingredients together, keep in covered containers.
Use 1 cup of the mixture per load.
Mom says "save your jugs".