As little as one billionth of a gram of urushiol oil (or nano-gram: 1 grain in a bucket of sand) can irritate sensitive skin and the oil can stay active on unwashed clothes and dead plants for up to five years! Yikes!
Directions for use: If you come into contact with poison ivy, wash skin in cold, soapy water and pat dry. Apply Poison Ivy salve often or at least 2x per day. Organics are easily absorbed by body tissues.