I have used Tecnu as post-exposure control for poison ivy with great success. Now that I have more yards, some days I'm working all day long. I think the poison ivy oil is setting into my skin before I can get home to use the Tecnu and I'm getting patchy rash. I would like to get some PRE-exposure poison ivy control to apply to my skin. What do you guys use to control poison ivy before you've been exposed to it?