1 gallon of vinegar, 1/4 cup of liquid dish soap. Spray it on thoroughly.
Be aware that it does not discriminate, so if you’re spraying near a plant you like, put something up to shield it.
It also doesn’t kill the root, so it may take a few passes. But it fries the leaves so well you’d think you’d just thrown battery acid on them!
Thanks! I will try it!