Actress Uma Thurman portrayed the villainess Poison Ivy in 1997's "Batman and Robin," and her effort earned her a nomination for that year's Golden Raspberry for worst supporting actress.

Apparently, Uma's Poison Ivy wasn't rash enough — and moviegoers weren't itching to see her.

The same can't be said for real poison ivy, the villainous denizen of the forest floor that frequently causes a severe, itchy rash.

Around 85 percent of people are allergic to the toxin in the plant's oil, called urushiol.

But if you come in contact with it — and 10 million to 50 million do every year — the Tennessee Poison Center at Vanderbilt University says you can effectively wash away 100 percent of the plant's oils, found in the leaves, vines and roots, in the first 15 minutes after exposure.

But if you let it linger, it's guaranteed to penetrate your skin and cause painful, itchy blisters.

If you come in contact with the plants, use soap and lukewarm water or a specially formulated soap (you can carry the solution in your backpack) to wash away the urushiol — and do it pronto.

Remember, oil can cling to your dog's coat, so wash you pooch off, too.

If you can't stop the reaction before it starts, there are somewhat effective over-the-counter creams. If the rash or swelling persists or it becomes infected, call your doctor.