If you come into contact with poison ivy or poison oak, washing the affected area with liquid dish soap within two hours of contact may prevent you from getting an itching red rash. Arkansas dermatologist Adam Stibich wanted to see if liquid dishwashing soap, which is formulated to remove oil, would be a cost-effective way to get rid of the plant oil on poison ivy leaves that causes a rash when it gets on your skin.

Volunteer medical students rubbed poison ivy leaves on their forearms and then washed with dishwashing soap for 25 seconds before rinsing. The soap prevented a reaction in almost half the volunteers and reduced the inflammation in the rest by 56 percent.

In his study, Stibich used Dial dishwashing soap, buy any brand will work.