First, I add the hard and soft oils to a large stainless steel pot. Make sure you are not using an aluminum pot. I can't remember how large this pot is, but I think it's a standard stock pot.
The trick is to stick blend the mixture while the pot is off the heat and hand stir when the pot is on the heat. I just rotate (on and off the heat) every min or so.
At this stage the mixture becomes thicker and is similar to thin pudding texture.
This is what the soap past looks like when finished. The paste should be the color of Vaseline, a shiny amber color.
After boiling the distilled water, and dissolving the Borax in the water, I add the solution to the soap paste.
This part is not a fun part. The paste has to dissolve into the water. This takes lots of stirring, and stirring, and stirring. I usually stir the pot, and come back every half hour and stir again. Keeping the lid on, and a towel over the pot, keeps the soap warm and easier to dilute. Did I mention you have to stir and stir and stir?
After a few sessions of stirring, I put the lid on and wait until the next day. After a night of resting, the lumps are easier to dissolve.
You can add fragrance when you add the Borax solution, but I like to keep mine unscented. I add the fragrance as the body wash is ordered. Adding fragrances and essential oils can change the density of the soap. Some will make the soap thicker, and some will thin the soap. I like to keep my liquid soap a little thick in case the fragrance thins when added.
Making body wash/liquid soap is not hard, but it is time consuming. I find it very rewarding after it is all finished. My recipe makes 6 pounds of liquid soap, so I make a pretty large batch.
I hope you enjoyed the process! Handmade body wash is made with pure fresh oils, and doesn't contain any additives or chemicals like store bought soap.