Then, in very small amounts (1 ml or less), add to your soap and stir. Continue adding the salt water solution to your soap until you’ve got the consistency that you want. To use, add 1 cup of your Castile Soap Laundry Detergent to your washer and use like you would any other commercial detergent.
Place the castile soap slices or chunks in a food processor bowl. Pulse the soap on high until the soap resembles large crumbs. Add the washing soda to the food processor. Place a towel over the top of the food processor lid, and pulse for 1 minute. After pulsing, the ingredients should be well combined.
Although listed as 'optional', sodium lactate is useful in hardening all soap recipes, especially softer soap like this castile soap recipe. It's available as a powder or in liquid form and if you're using the liquid form, you'll need one teaspoon of it.
Pulse the soap on high until the soap resembles large crumbs. Add the washing soda to the food processor. Place a towel over the top of the food processor lid, and pulse for 1 minute. After pulsing, the ingredients should be well combined.