I would get it head to toe as a kid, shots, doctors, clorox I've had it all. None of that bull works. Clue, if it sounds like a stupid idea, it is. If you'd rather see someone ELSE try it first, its a stupid idea. Don't spread it, people get desperate.
The flat truth is it is an oil on the plant. Urushiol people are allergic to. It is like axel grease and spreads and gets all over everything because you don't know it is on you until it starts to ith, hours later after you've spread it all over everything from shoe laces to hat brim and coated the dog with it.
EVERYONE IS ALLERGIC TO IT. Ignore what they say, they are. It is just a matter of tolerance. How many times a person gets exposed before THEIR body says "thats it, NOW YOU PAY" and they will react to it from then on.
Use hand cream, vasoline, what ever BEFORE EXPOSURE if you KNOW you are going in the danger zone today. Take a benadryll, or a Zantac or a Zertec before you get in to it. Do all that "danger" stuff at once and then quit. Take all those contaminated cloths off and wash them like they were ruined with radio active axle grease.
Meanwhile get your self straight in to the shower and scrub with soap and rinse, a few cycles like you are trying to get road tar and feathers off your skin.
The quicker you get that done, less exposure, and the more thoroughly done, and don't "pet the dog", the less your poison ivy, poison oak, giant hog weed suffering will be.
Or you can just have a poison ivy salad for lunch like great grampa NEVER DID. HE JUST THOUGHT IT WAS A FUNNY STORY. That is sarcasm.