★★★★★
30 years ago, I was helping a man paint his farmhouse that was covered with untrimmed bushes and poison ivy (PI). I am very allergic to PI and always broke out in a rash. I had to move ladders up close to the house to paint up high and of course, got in to PI.
The guy I was working for told me to go to the kitchen and get the dishing soap by the sink. We walked over to the water hose next to the house and he told me to get both my arms and legs wet, pour some dish soap on my hands and soap up all the exposed skin just like a surgeon before surgery. By doing this, the soap removes the invisible plant oil “urushiol” from your skin that causes the rash. If you do this within 6 hours after exposure to PI, you will never breakout.
He also told me that when I got home to put all the clothes I was wearing that day into the washing machine with HOT water. This will remove the oil from your clothes.
Now, if you happen to miss a spot or did not wash your skin very good and you do get a rash. Get into a hot shower with dish soap and repeat the process. Also, applying fresh lemon juice to the rash will help to heal the rash a lot.
By following these protocols for the past 30 years, I have not had a serious outbreak of PI since!
Good video on the subject: How to never have a serious poison ivy rash again