In a food processor with a grating attachment, shred the bar of soap (or do it manually if you'd rather, but use the finest grate on your grater). Remove the grating attachment and add the washing soda, baking soda, and salt to the food processor then pulse together until a fine powder results (or if you're doing it manually, just mix the finely shredded soap and the powders together in a bowl).

To use, add 1 tablespoon (2 tablespoons for very soiled clothes) to a regular load of wash.

In a large pot, bring about 4 cups of the water to a boil. Gradually add the washing soda, baking soda, and salt. Stir until dissolved.

Allow to cool until touchably warm then pour into a bucket or some other container (I used to use an empty, cleaned out plastic kitty litter jug; I marked a 1 gallon line on side so it involved less measuring). Add the remaining water then the liquid Dr. Bronner's soap and Thieves Household Cleaner a little at a time, stirring after each addition.

Stir or shake (with a lid on of course) before using.

To use, add about 1/2 cup (more for heavily soiled clothes) to a regular load of laundry.