To get rid of dandelions, spray straight vinegar into the center of each plant and in about two weeks they will all be dead and gone. Any that haven't disappeared will be dead and can be dug/pulled out. (There shouldn't be any). This really worked for me and they have never grown back in the area I treated. ONLY in the center of the plant, not on the grass.
Source: The Vinegar Book
By katesnanna from Brisbane, Australia
Yes, vinegar will work as an herbicide. Be very careful not to get it on any plants that you want to keep, it will kill them as well. It is not a pre-emergent herbicide, so you will have to re-spray to get new weed plants, but it is somewhat easier on the environment.
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