How to avoid poison ivy rash
by Mark Frauenfelder from on (#1KFEM)
The stuff in poison ivy that gives you a rash is greasy and hard to get off your skin. To avoid a rash, scrub your skin 2-8 hours after exposure with any kind of soap and a washcloth or loofa. Lots of friction is needed to wipe off the grease, called urushiol.
(Thanks, Wendy!)