New Tecnu Extreme from Tec Labs is a one-step scrub and treatment for poison oak, ivy and sumac. Developed with chronic sufferers in mind, Tecnu Extreme removes the rash-causing oil, urushiol, from the skin to prevent the rash, or if a person already has the rash, the product stops it from spreading. Active ingredient stops the itching and speeds healing.Tec Laboratories, Inc., Albany, OR.