posted 6 years ago
Any soap or detergent works to prevent poison ivy!
Any soap or detergent works to remove the urushiol oil IF you wash everything before it has a chance to sink into your skin.
My father was, and I am, very very reactive to poison ivy. He was convinced that we had to use dishwashing detergent (whatever bottle was on the sink), and after any suspected exposure we would peel off clothing directly into the washing machine and wash our arms, feet, and face with dishwashing detergent. We'd run the clothing through the laundry with any laundry detergent. It always worked (when we knew we had been exposed).
I read up about it and realised that any soap that removes oil would work. And it does! The essential thing is to think about the urushiol oil, and any way that it could get onto your skin and stay there for a day. Think of clothes, shoes, socks, outerwear, pets, goats, hair, etc. Things that you take off, don't wash, and put on again days later can expose you to urushiol and give you a rash.
When I lived in the US I'd get a little poison ivy on my face every year or two, because I have a habit of washing my hands with soap a few times a day, and I guess I'd get exposure on my hands, touch my face, and then wash my hands as a matter of course, but not wash my face until the next morning.
Once in the winter, I sat with a friend in the woods, winding roots into shapes. Suddenly I remembered that in summer, that spot is lush with poison ivy, and those roots were probably it. We went back to the house and washed our arms, face, etc with soap, and threw our clothing into the machine, but not his leather jacket. We both escaped poison ivy rashes on our faces and hands, but he got it so bad on his arms that he ended up in the emergency room for cortisone shots. It is clear that while the oil was on his hands and he took the jacket off, the insides of the sleeves got coated. For days, the insides of the sleeves continued to apply the oil to his arms. What a disaster! But it sure proved the efficacy of soap in preventing it, and the importance of thinking through your possible exposure very very thoroughly.
Works at a residential alternative high school in the Himalayas SECMOL.org . "Back home" is Cape Cod, E Coast USA.