Dissolve the salt: Pour the salt into a large container or pump sprayer, add a little of the vinegar, and stir until the salt is completely dissolved.
Add the rest: Pour in the rest of the vinegar and the Dawn dish soap. Mix well, but do not shake vigorously to avoid excessive suds.
Application: Pour the mixture into a spray bottle or pump sprayer. Coat the foliage and stems of the weeds thoroughly