Best Choice if Rash Has Sarted: Tecnu Extreme Poison Ivy and Oak Scrub gets to the root of your problem by removing the oil (urushiol) that causes the rash, spreading and itching Removes The Source Of Itching: If your itching is unbearable, Tecnu Extreme removes the source of the itching to allow your body to begin its natural healing process unimpeded Simple & Easy To Use: Works in 15 seconds. Apply to entire body. Wet skin and apply Tecnu Extreme, gently scrubbing for 15 seconds. Rinse with water (not hot). Gently towel dry. Repeat as necessary Complete Your Treatment: After using Tecnu Extreme you can treat any remaining rash symptoms with Calagel Anti-Itch Gel or Tecnu Rash Relief Spray.