Worry Free Organic Weed Killer . Has anyone used or heard anything about worryfree weed and grass killer? To kill the weeds, which seems to also be an insecticide. Homemade Weed Killer 3 Ingredients Kitchen Fun With My 3 Sons from kitchenfunwithmy3sons.com 8% clove oil, 8% cinnamon oil, 4% citric acid + lecithin. If there are especially stubborn weeds, we do use it at. Natural and organic weed killer.