Not sure if I remember this thread from last year, didn't go back & re-review it all. We all know the weed killers work by absorbing into the leaves, however the waxy/oil on the leaves keeps this from happening. Adding the extra surfactant to the (weed killer) mix, use a mix of DAWN dish soap for oil/grease or diesel fuel as the liquid will penetrate the waxy oil on the leaves much better than just water & weed killer.
Same for symptoms of P.I. or P.O. it is best to "Prevent" it getting to you first, there are products on market called "Invisible Glove" which is a lotion that is wiped on and acts like a latex glove. Use that first, then use lots of layers of clothing, gloves etc.
Clean up
Peel off each layer and drop into garbage bag for washing at commercial laundry so you don't contaminate the house washer. Then jump into COLD WATER shower with DAWN Grease remover dish soap. Scrub two time then use hot water and dawn followed with some skin lotion to put back some of the natural oil in your skin.
Any tools you used be sure to wash them off with HOT water and DAWN or similar degreaser soap. Follow up with a coat of WD40 & light oil to prevent rust.
Mark