Use Tecnu Outdoor Skin Cleanser after you have been outdoors to remove the rash causing oil urushiol. Simply apply Tecnu to dry skin for two minutes and rinse with cool water or wipe off with a cloth. When used within 2-8 hours after exposure to the plants. Tecnu can remove urushiol oil before the rash begins. Once the rash has started, washing with Tecnu helps remove any free oil on skin allowing the natural healing process to begin without possible recontamination.