I have used vinegar in the past. It is not very affective on most weeds but it does damage them. I am probably waiting until they get too old to spray them. There used to be a herbacide that was vinegar based (Scythe I think) that had a higher acid concentration. I definitely would only use the recipe that includes salt on the driveway or walkways or nothing will grow. I am tempted to get a weed flamer.
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