When I first made the homemade laundry detergent I didn't have a functioning camera. Now 7 weeks later I have to make another batch so I took the opportunity and took pictures.
The first batch lasted 7 weeks! I can't believe it and it was only 1 1/4 cup Naptha soap, 2 1/2 cups Washing soda and 2 1/2 cups Borax! I had to add some washing soda and Borax because the mixture was too strong and I only used half a tablespoon instead of a whole tablespoon per load of laundry (more for bigger or very dirty loads). So this stuff goes a long way. In the meantime I've also discovered that our local Kroger does have the Naptha soap. It was just hard to find :)
What I do now it that I use 1/2 part Naptha against 1 part washing soda and 1 part Borax. And this is what you get:
I grate the bar of Naptha soap (like I would grate a carrot) and then I put it in the mixer to break it up even more. The smaller the soap particles the better. It's all about getting the biggest surface area for the mixture to clean more efficiently. This soap is very strong and you should wear gloves (latex) and wash the grater and mixer very well afterwards. It would be best to have separate equipment to use for the soap that would not be used for food.