PSA: Kills Dandelions ... Doesn't Kill your Kids or Pets! 1/2 gallon of Apple Cider Vinegar 1/4 c table salt 1/2 tsp Dawn liquid dish soap Mix above ingredients in a spray bottle. Spray weeds thoroughly. The Dawn dish soap strips the weed of its protective oils so the vinegar can work with deadly force. Actually better than insecticides you buy at hardware store.