Place herbs in a heat-safe glass jar. Pour 1 cup boiling water over the herbs, cover and let steep until the mixture reaches room temperature (about 20 to 30 minutes).

Strain the tea and compost the herbs.

Add the castile soap and gently mix the soap and herbal tea.

Dilute the essential oils (if using) in the jojoba or argan oil and add that mixture to the soap/tea mixture.

Optional, if using ~ Add the natural preservative according to the manufacturer's instructions.

Transfer to a re-usable soap bottle and use within 1 week (without preservatives) or store for extended use with preservatives.