Contact with irritants from poison ivy, oak and sumac can turn into itchy problems. Use Tecnu Original Outdoor Skin Cleanser, a poison ivy wash, after you have been outdoors to remove the rash causing oil, called urushiol (oo-roo-she-all), from poison ivy, oak and sumac. Product Description Wash with Tecnu to remove poison ivy, oak and sumac oil. Simply apply Tecnu to dry skin, rub vigorously for two minutes, and rinse with cool water or wipe off with a cloth. When used within 2-8 hours after exposure to poison oak, ivy or sumac, Tecnu can remove urushiol oil before the rash begins. Once a poison plant rash has started, washing with Tecnu helps remove any free oil on the skin allowing the natural healing process to begin without the possible spreading of poison ivy or oak (re-contamination). Poison ivy and oak oil can also spread from contaminated clothing, shoes, gloves, tools and pets. Since urushiol oil does not evaporate, it can remain on these items for months or even years at a time. Use Tecnu Original to wash off the oil and avoid a poison ivy or oak rash from secondary contact.