Tecnu® Original Outdoor Skin Cleanser was developed in 1962 and has been proven in the field by outdoor professionals. It is a unique, affordable cleanser that removes the rash-causing oil, called urushiol, found in all parts of poison ivy, oak and sumac plants. Tecnu Original is the only topical cleanser on the market that you can also use to remove poison plant oil from pets, tools, clothing, and equipment to help prevent coming in contact with it from a secondary source.