I buy a liquid product called Spectracide - it kills pretty much within 12 hours - I spray big weeds then pull them up easily - great for grass growing in cracks of the sidewalk or patio, that sort of thing - there is even a battery sprayer attached to the container so I can spray a larger area without causing my hand to go into cramps!
spectracide? i will look for it. i have weedBgone in an industrial strength sized jug but with the hand operated squeezer, battery sprayer sounds fantastic! i soak the roots of the suckers, and will go back and pull them later.