Hot water doesn't "stop" the rash. It stops the urge to itch for awhile.
I have a PHD in Poison Oak, I pretty much grew up in it.
As a kid I used to get it bad, not JC bad (bright red ass), but damn bad each summer. I used all the home concoctions, cold batch with corn starch, bleach, any and everything.
So as I was battling another annual round, for some reason I was on the phone talking to a advise nurse and she asked me a pointed question...."have you washed ALL of your cloths, bedded, and shit just about everything?"
Ugh, nope had never thought about it until that moment. What can I say, we were poor and in the hicks, and both parents were from the city-ish?
After that I stopped getting it from head to toe as I would wash everything.
JC better just stick with the routes on Discovery Wall, except February Fools....Or Klink has to always break trail.