Poison Ivy Bar w/Jewelweed, 2.0 oz. If exposed, wash contact areas well with cool water and GRANDMA’S Poison Ivy Bar to remove poison oils. (Cool water keeps the pores closed reducing the likelihood that the oils will penetrate the skin.) If rash develops wash & rinse affected areas with Poison Ivy Bar and then pat a little lather on the rash and leave on to dry, which will stop the itch immediately. Repeat as necessary to control itch, including itch from bug bites. (Lather dries clear and won't stain fabrics.) Colloidal oatmeal also helps calm inflamed irritated skin.