You will also need a cutting mat, knife, measuring cup, food processor and a bucket. I had a little store bought detergent left over in a plastic container, so I used that.
The food processor that I use is an attachment that came with my blender. It was a wedding present over 20 years ago that I haven't used much. I've used the blender but not the attachment. First I measured out the washing soda and borax and added it to the container. I left the left over laundry detergent in the container since it won't hurt.
Next I chop the soap bar up into about 1 inch cubes. You will notice the bars are a little sticky. They will stick to the blades of the food processor and gum everything up (trust me). To keep this from happening, put a little of the powder from the laundry bucket in with several chunks and blend in small batches. I throw an old washcloth over the food processor to keep the little dust from flying everywhere.
When you are done processing all of the soap bars and have added them to your laundry bucket you will notice that the pink chunks are larger then the white powder. When you scoop it, you don't get a very even mix.
Let me know if you make any...or if you have any tips.