And fun fact, that hairy rope retains the oil basically forever.
Last year we moved into our new house, which had sat vacant all summer. Poison Ivy grew up over the porches and doors as some sort of ominous warning. We did our best removing it, but a year later I still occasionally brush up against little dead bits remaining on the brick and develop a rash. Those little hairy rootlets attach to surfaces with what seems like the strongest force known to man.