- 1 bar of shaved bar soap, any kind (Ivory, ZOTE, Fels-Naptha)
- 1 box of borax (76oz)
- 1 box of washing soda (55 oz)
If you click on this link, it will take you to a picture tutorial on Instructables of how to make it. Be sure to read the comment section while you are there, the author answers many questions that are very helpful.
{You can use a food processor to break up the soap,
in the link above, she uses a micro-plane to grate it, which would make it more fine}