The oil (urushiol) that causes the rash from poison ivy, oak, or sumac can be picked up by the skin from:
Clothing that may have urushiol on it should be washed thoroughly, in bleach if possible. Other contaminated objects or surfaces can be cleaned with rubbing alcohol. Pets who have been in areas containing poison ivy, oak, or sumac should be washed with pet shampoo to remove any oil from their fur.
WebMD Medical Reference from Healthwise