As someone who lives in a rural area and has had more than a few bad experiences with Poison Oak, I thought I'd share some interesting info that I've come across over the years......BTW, I can roll in Poison Ivy and it doesn't bother me at all, but Poison Oak get's me bad......
Some Poison Oak/Ivy Facts:
1. The Urushiol oil in poison oak and ivy (that which gives you the rash) is extremely potent and can be delivered to your skin from contact with ANY part of the plant, leaves, vines, flowers, dead, alive, etc.
2. Urushiol oil is VERY potent--2 micrograms of urushiol oil is enough to give someone who is sensitive to it a bad rash--for comparison one grain of table salt is about 60 micrograms......in theory the amount of urushiol oil equal to the size of one grain of table salt would give 30 sensitive people a skin rash, and the amount of urushiol oil that would fit on the head of a pin is enough to give 500 people a rash........
3. Contrary to popular belief, the rash does NOT spread from the weeping/feline skin blisters...the rash is ONLY caused by the oil itself contacting the skin. Many people go to great lengths to bandage and cover their rash in the false belief that the fluids from the rash will get on their sheets, clothes, etc and spread the infection--this is NOT TRUE. While it's true that the affected area can get larger over a few days, the fact is that the urushiol oil had already been absorbed into the skin, and it just took a few days for it to manifest itself in a larger area. I used to spend a lot of time and money trying to keep the rash protected so it wouldn't "spread," now I know the facts!
4. Ethyl alcohol (NOT Isopropyl!) is the cheapest and most effective way to remove the oil from your skin immediately after exposure. After 30 mins to an hour the oil has already been absorbed into the skin, then your best bet is Technu.
5. Technu is probably the best product out there to clean the urushiol oil from your skin after a few hours have elapsed since exposure.. Interestingly enough, it was originally designed in the 50's to clean nuclear contamination from soldier's skin, it wasn't until the 80's that it's ability to break down urushiol oil was discovered--completely by accident. As someone else mentioned, Fels Naptha soap is also very effective for some people.
6. One of the best secrets for minimizing the itching and healing faster is to take VERY hot (as hot as you can stand it!) showers. The heat of the water releases the oil from the skin faster, and this reduces the amount of histamine that your skin releases (what makes it itch....). If you've got a bad exposure, frequent very hot showers are your best friend.....it can stop the itching for several hours at a time!
7. Many people get urushiol oil from their pets as the oil easily bonds to clothing and fur.....if you're in an area with lots of poison ivy/oak and you have pets, keep a bottle of Ethyl alcohol around (about $1 from the drugstore) and wash your hands with it right after playing with your pets......
Hope maybe this info will help someone--I've learned all these lessons the hard way
NP