Learn how to never have a serious poison ivy issue again with this technique. If you ever do come into contact with poison ivy, or suspect you may have, then you need to wash the oil off your skin within 2-8 hours, the sooner the better. You should use cold water, soap, and a washcloth to help get it completely off your body. The key is to use a washcloth, which provides the necessary friction, on all possibly contaminated areas of your body. A washcloth, loofah, or towel is what works best to pick up and remove all of the oil. It doesn’t matter what soap you use but never wash with hot water since it opens up pores and allows the urushiol in.