The answer to a cockroach invasion is to identify and eliminate the root causes, such as access to food, water, and harborage. Cockroaches can be a persistent and difficult pest to control, and require a multi-pronged approach.
Common causes of cockroach infestations include leaks, cracks, and crevices that provide access to food and water, as well as clutter and poor sanitation that give them places to hide and breed. Symptoms include seeing live cockroaches, egg cases, droppings, and a musty odor. DIY solutions like baits, traps, and insecticide sprays can be effective for small infestations, but for larger or recurring problems, it's best to call in a professional pest control technician who can perform a thorough inspection, identify the root causes, and implement an integrated pest management plan.