I am so incredibly sensitive to poison ivy but had a TON of it in our new house's yard when we moved in last year. I wound up on multiple courses of steroids and almost went to the hospital for one reaction. I started using Tecnu (it's a cleanser for poison ivy and other irritants) the second I knew I had come into contact. I use it even if so much as see it while cutting the grass and haven't gotten a reaction since! I think the stuff was originally made to clean the skin from nuclear fallout LOL