I have Bermuda grass. It is nearly impossible to remove by hand or even mechanical. Rototilling seems to encourage it.
I used Grass B Gon after reading an earlier post by TvGuy3. I treated the areas twice, 7 days apart. The Bermuda grass died. Wherever I used Grass B Gon, the area was grass free for a very long time.
However, the Bermuda is creeping back in so I will probably need to do it again next year
