My own 2 cents worth of an isolated usage of vinegar:
I had a small area (about 5 ft x 10 ft) full of weeds that I never wanted (and still don't!) anything to grow in ever again. And a small note: we have very heavy clay soil in that area. So. I liberally sprinkled the area with table salt, then soaked it all down with straight, undiluted vinegar. Definitely killed off all the weeds and lasted for about a year. The following year, the weeds were happily filling up that same area. Now perhaps the winter snow and rain leached out the salt and vinegar. But it was definitely a short term effect in my case. So I look somewhat askance when I hear people predict dire consequences from using either vinegar or salt. However, it WAS a one time experiment in a very limited area.
