What household pests does ammonia kill?

Ammonia is effective against a variety of household pests, including ants, cockroaches, and some types of Spiders. Its strong smell can deter these pests and, in higher concentrations, can kill them on contact. However, it's important to use ammonia with caution, as it can be harmful to humans and pets if inhaled or ingested. Always ensure proper ventilation and use protective gear when handling ammonia.