Noun
A kind of fine, hard, white or mottled soap, made with olive oil and soda; also, a soap made in imitation of the above-described soap.
Source: Webster's dictionaryCastile soap is a popular example of the vegetable-only soaps derived from the oldest “white soap” of Italy. Source: Internet
For an all-purpose—and pleasantly aromatic—household disinfectant, add essential oils to a mixture of water, castile soap, and hydrogen peroxide. Source: Internet
The ideal soap is a liquid soap, such as castile soap, like Dr. Bronner’s, liquid hand soap, or liquid dishwashing soap, such as Dawn. Source: Internet
It’s safe and preferable, Bronner says, to use Castile soap and vinegar in sequence: Clean with Castile soap and follow that with a vinegar rinse to remove any soap film. Source: Internet
Despite many recipes on the internet that claim otherwise, castile soap should never be mixed with an acid like vinegar or lemon juice because the soap is a base and vinegar and lemon juice are acids that will reduce the soap into useless oils. Source: Internet