what kills off grass
Instead, use the solution of salt, water and vinegar to kill grass and weeds that pop up in undesirable locations, such as sidewalks and driveways. Mix 1 cup of salt with 1 cup of boiling water and 1 cup of vinegar to create a potent weed and grass killer.inegar. Vinegar can kill weeds and grass when undiluted, but mixing it with boiling water brings the power of the acetic acid in the vinegar together with the heat to create an effective plant killer.