Europe. This is a list of the largest cities in Europe by population within city limits. It deals exclusively with the areas within city administrative boundaries (municipalities) as opposed to urban areas or metropolitan areas, which are generally larger in terms of population than the main city.
I'm making my own soap treatment taht will have 22 different natural ingrediants that will first, remove the oils from the deep in the skin (homemade lye & lard soap is good for that) second, dry it out, third, actually cure the poison ivy dermatitis, and fourth, sooth the itching. I sure hope is works.
But if you're outdoors with no sink in sight, that's another story. Rubbing alcohol can dissolve the oil on the skin. I carry rubbing alcohol pads in my first aid kit that can double for poison ivy duty. Lately I've also been carrying a very small spray bottle of 91% rubbling alcohol.