If you know you have been exposed to poison ivy, or oak, jump in the shower when you get home. Now, here is the key; borrow the plastic "fluffy" your wife likes to use to de-foliate and scrub your skin using dawn or ivory soap. The agent (from the plant) causing the skin irritation (rash) is an oil you pick up on your skin and/or clothes from the leaves or stalk(s) and a good scrubbing of your skin surface should remove most, if not all, of the oil. Just make sure you shower/scrub within 3-4 hours from exposure. Good luck!
P.S. wash you work clothes (whatever you were wearing when exposed) before you wear them again
Let me add this... After a day in the woods, your boot laces most likely have the oil (Urushiol) on them and that oil lasts a long time. A typical scenario... We come in from working, remove our clothes and wash or shower. We're usually good at that point, because we've scrubbed the oil off our skin. But a week later, with our bare hands, we put on those boots and tie them...we immediately transfer the Urushiol to our fingers and since we're going out to work, few of us wash our hands
after we've tied our laces, and it will be hours before we wash our hands again. We may even contaminate the
insides of our gloves. I'm convinced that is how a lot of us get that miserable rash between our fingers.
We may wear gloves for working and think we are protecting our hands, and we are. But if you bare-handled your boots
before going out to work, you've put poison ivy on your hands.
Tools, tractor tires and implements, anything that comes in contact with Urushiol can transmit it to our bodies for months. Be careful what you touch.
I've even gotten the rash on my ankles because I took off my boots and socks before I took my pants off, and didn't shower soon enough. My pant cuffs had Urushiol on them and rubbed against my ankles after I removed my socks.
Ya gotta pay attention to anything that comes in contact with 3 leaves.