How about giving them weeds a little steam bath? Weedtechnics - Saturated Steam Weed Killer / Steam Weed Control
No doubt! I'm not taking any chances by inhaling some poison ivy smoke. As a kid I spent about a week wrapped up in old strips of sheets with Calamine lotion applied after getting poison ivy dermatitis on most of my body while digging up sassafras roots for tea. I still kind of shudder when I see poison ivy.