For those of us who do not want our kids exposed to harmful chemicals this homemade weed killer works out great. I have tried it out and it really does work. Be careful to avoid spraying it too close to anything you dont want to kill. Here is the recipe.
1 gallon of white vinegar
1 cup of table salt
1 tablespoon of dish soap (like dawn)
Mix everything together making sure that the salt is completely disolved. You can pour this into a spray bottle or one of those larger sprayers like you'd use for fertilizer. Spray the solution directly onto the weeds and they will wilt quickly.