Salt, and Dawn. However, there is a caveat to this working which is that the normal vinegar you usually buy in the store is probably NOT the right vinegar to use.
One of the more interesting ways to use Dawn dish soap is as a weed killer! A mixture of Dawn (1/2 teaspoon), salt (1/2 cup), and white cleaning vinegar (1/2 gallon) can help keep weeds under control. You can spray or pour it directly on the offending plants, being sure to av...