Answer:
Nope, once it's soaked in the skin your done!
if you think you have been exposed to poison ivy you have two hours or less to wash it off, but once it's soaked into the skin your just going to have to let your body try and fight it off!
Also remember to always wash with cold water if you think you have been exposed to poison ivy! if you use hot water steam opens up your pours and gives the oils a door wide open into your skin!