Here in the Fl. Keys we have a tree called Poisonwood with the same agent(Urushriol)as Poison Ivy. Being in the landscape trade for many years I had my share of run-ins with the stuff. By far the most successful treatment has been using a product called Zanfel. In the shower you squeeze a small amount on your hand and scrub the affected area for about 30 secs.Then rinse the area. There is a bit of pumice in the salvelike product. Zanfel binds with the urushriol oils and is rinsed away. I have always used it well after exposure when the blisters have begun. Itching stops instantly and the blisters heal nicely. Sometimes it will take a couple treatments but "Oh, what a relief it is".Zanfel is a bit pricey at $35.00 for a couple ounces but well worth it and has a shelf life of several years. Great stuff!!!

Scott