The time to use this safe, effective, and very cheap poison ivy killing folk formula is in the spring, when the poison ivy leaves are young and shiny.
Ingredient
Vinegar
Just buy a big jug of vinegar–white distilled is cheapest–and pour it straight onto the young, shiny leaves. Be aware that the vinegar will kill surrounding plants, so pour with focus!
If a stubborn case, add 1 cup of salt to 1/2 gallon of vinegar.