I was half joking (wouldn't surprise me at all if it were banned here outright), but my neighbor gets concentrated Roundup that pretty much destroys anything green. We spray it between our properties. Nothing grows there most of the summer. He hits it again in July or so, and that's it. Works damn good.
Some tricks to getting rid of it: 1) Add a surfactant to the weedkiller - this makes a big difference because the leaves are covered with hairs that prevent the solution from wetting them otherwise. I use Top Surf at Tractor supply. 2) spray twice a couple of months apart