The best way to kill the ants professionally is to use an aerosol spray. Though it does not permanently destroy the ant nest, it works well with killing the ant instantly. Ant gels can be a permanent solution for destroying ants. It works as a food attractant and ants carry this to their nest which results in tearing down the whole nest. Granular ant baits are the best indoor and outdoor solutions for killing ants. Ants get attracted to it and carry it into their homes. Its toxicity permanently demolishes their nest.