bleach, the only time this did not work, I ended up in the hospital with poison Ivy down my throat, and I couldn't see trying that approach. lol. Mix it in water in the bath tub or a big bowl and put your affected area in the water for a couple minutes. Should be fixed, if not, repeat. Works everytime.
This is CABL.com posting #174941. Tiny Link: cabl.co/mTFN