The nice thing about RD UP is it only kills whats up.
It will not keep anything from growing back.
The reason that is nice is it doesn't leach through the soil.
Buying at a farm supply store will save big bucks and there are a lot of RD UP knock offs.
A gallon of concentrate should run around $15-$20 a gallon.
I mix 10 oz in a 4 gallon back pack.
The vinegar and salt thing is more toxic than RD Up if you look up the LD-50.
Edit: Guess I didn't read page 2!
Surflan works well for us in SOME conditions, depending on what we are trying to control weed wise.
The challenge is I believe it only comes in a powder and needs constant agitation, which doesn't work well for most home owners.
2001 Monaco Windsor 40 PBD