I am highly sensitive to P Ivy, Oak, and Sumac. Take your pick. I have actually been admitted to the hospital twice with it. Not much fun.
After the many times I have gotten it, I have learned to wash down everything I own in old fashion, out of the box Tide. When I say everything, I mean me too
When I get home from hiking or working in the yard I have a small box of Tide that I wash me off with. Along with that I wash all my clothing and even my tent/hammock on gentle with Tide.
I been doing it for the last 45 years and any reaction has been mild compare to what I had before. My Mom started using the Tide on me at the recommendation of the doctor after my second hospital visit. Below is a cut/paste from a source about soaps. I suspect the suspending ability until rinses is why Tide takes the PI oil out of clothing and off skin.
"Procter & Gamble began an ambitious mission to change the way Americans washed their clothes. Researchers discovered two-part molecules which they called synthetic surfactants. Each part of the "miracle molecules" executed a specific function--one pulled grease and dirt from the clothes, while the other suspended dirt until it could be rinsed away. In 1933, this discovery was introduced in a detergent called "Dreft," but it could only handle lightly soiled jobs. The next goal was to create a detergent that could clean heavily soiled clothes. That detergent was TideŽ.
Created in 1943, Tide detergent was the combination of synthetic surfactants and "builders." The builders helped the synthetic surfactants penetrate the clothes more deeply to attack greasy, difficult stains. Tide was introduced to test markets in October 1946 as the world’s first heavy-duty detergent."