There are a few different things that can kill an ear infection. The most common and most effective method is through the use of antibiotics. Antibiotics work by killing the bacteria that is causing the infection. Another method that can be used is through the use of ear drops. Ear drops contain a variety of different ingredients that can help to kill the infection. The most common ingredient in ear drops is vinegar. Vinegar is an acidic substance that can help to kill the bacteria that is causing the infection.