Ants usually come from an ant nest so the initial thing that you should do when you are bothered by ants is to find where they come from. Kill the source! Some sprays do not work, you have to find another source that will not harm the people at home and just destroy the ants. It is possible. When you declare a war against ants you have to indicate it. When you find the ant nest, you can use a diluted liquid pesticide and put on it. It will not only drown and kill the ant workers but it will eventually kill their queen too. This strategy is best used on fire ants and carpenter ants. You will require to use a different method when you want to kill house ants.