|Borax, bar soap, and washing soda (NOT baking soda)|
We use a microplane to grate our soap because it gives you the finest pieces to more uniformly blend with the other ingredients. This last batch I made I tried to take a short cut by grinding the soap in the food processor and I'm guessing that because the Ivory is such a soft soap that's the reason it ended up basically remelting back into a solid at the bottom of the processor. Maybe if we used a harder soap like Fels-Naptha it would have been fine but I guess the old expression about if it ain't broke, don't fix it, applies here. (Update: I just made a batch with the Dial Basics and was able to grind it in the food processor just fine.) Mix your three ingredients and you're done.
The great thing about making your own laundry soap is you only need to use a tablespoon of it per normal size load so it lasts a long time. Plus, each batch does approximately 40+ loads so that comes out to about $.05 a load (way cheaper than store-bought soap).
The only thing I miss with using this laundry soap over a kind I buy in the store is the smell. Your clothes will come out just as clean as the name brand, store bought stuff but there is no scent, just the smell of, well, clean clothes I guess. Also, we use dryer balls instead of dryer sheets so there's no chance of a lingering fake fresh scent on our clothes. And actually, now that I'm used to it, it seems so foreign to me now to have clothes that I washed on our vacation still smelling of Tide (not that I don't love and miss that scent every now and then.)