Grate the bar of soap; set aside.

Bring the water to a hard rolling boil.

Pour the water, grated soap, washing soda, Epsom salt, and Thieves cleaner into a large heat-resistant container. Stir until everything is mixed and the soap and powders have dissolved.

Allow to cool, stirring occasionally. Once cool, an egg drop soup consistency will result.

To use, add 3/4 cup to a regular size load of laundry, plus add 1/4 teaspoon citric acid.