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Jamie,Is that recipe for killing it on the vine? Or is that for treating the affected area on yourself?
You are right about prevention being the key. But your post goes downhill fast after that. There is no need for fancy expensive products. Just use soap and water, and wash as soon as you can. I'll explain why, but if you don't like science, you can stop reading now.
"Most surfactants like soap don't work either."
Incorrect. Urushiol (the oil from poison ivy) is lipophilic. Lipophilic means "oil-loving" and mostly insoluble in water. Soap does a fine job of making lipophilic substances water soluble. It does this by forming micelles, which are basically microscopic droplets which are lipophilic on the interior and hydrophilic on the outside. That is how soap works for washing dishes or getting grease off your hands. Washing urushiol off something is no different than washing off olive oil or bacon grease.
"Because the poison is an oil, water just moves it around."..."start sweating and it drips on everything"
Again, incorrect. A lipophilic substance like urushiol has a very low solubility in water or sweat (which is mostly salt water). That's the same reason you can't wash off bacon grease in water or saltwater. The way urushiol transfers is not in sweat, it is by directly smearing it onto clothes, car seats, etc. That's why you need to wash as soon as you can, to keep from smearing it around all over yourself or your surroundings.
This info is some of what people get in organic chemistry 101, just a basic understanding of how soap works, and the solubility behavior of hydrophilic and lipophilic substances. If you want to make easy money, Ivy Block and Technu are fine gimmicks to extract large amounts of money from people who have not taken a course in organic chemistry.
Just use soap and water, and wash as soon as you can. No need to make this expensive or complicated.
Fortunately I seem to be immune to the stuff,lucky since Florida is a greenhouse for growing anything.
Thanks for the home recipe Jamie.
Long pants and be aware of your surroundings. Maybe even bring a pair of gloves for removal from said plants.
"Leaves of three, let them be"!