Important ingredients such as Bentonite clay in the Itch Relief soap can bind itself to and draw out oils like those from poison ivy—so they get washed off with the soap. To maximize the all-natural ingredients’ power, some are steeped and aged. The soaps are super smooth on one side and grainer on the other, offering some very benign exfoliating as well as cleansing.
If you’re using the soap preemptively, leave it on for five minutes then rinse. But if you’re treating an already-developed irritation, you can actually lather and leave it to dry without rinsing.