Wash away the itch in 30 seconds with Zanfel. Active Ingredients: Polyethylene Granules; Sodium Lauroyl Sarcosinate; Nonoxynol-9; C12-15 Pareth-9; Disodium EDTA; Quaternium-15; Carbomer; Triethanolamine; Water Uses: A specially formulated wash for urushiol-induced contact dermatitis. Unushiol is the toxin known to cause the itching and rash associated with poison ivy, oak, sumac. poisonwood and related plants. The most important step in eliminating the rash is to remove urushiol from the skin. The wash works by surrounding urushiol and bonding with it, enabling it to be rinsed away with water. The wash offers relief at any stage of the reaction and often with only one wash. Most individuals experience relief from the itching within 30 seconds of application. The rash will begin to subside within hours if the reaction is mild to moderate.