Another trick i remembered today is cover the area with a huge tarp for a few weeks, it'll kill everything under it, making it much easier to clean. Let's say i had a scrap steel pile that gets lost to the weeds, I'll take a saw and knock everything down, then throw a tarp (used billboard ads are the best, super heavy tarp for cheap) over the area, come back in a couple weeks and it'll be bare soil almost... if you got the time, this can make your life easier too.
If you hit everything with a weed burner too, it'll speed it up