Gel versus spray: what the method tells you about the company
Spraying has its place. American cockroaches, the large ones that come up from drains, manholes and garbage rooms, respond to residual spray barriers around entry points, drain treatments and perimeter work. A thorough visit for a typical apartment combines both: gel in food areas, targeted spray at entry routes, and dust or foam in wall voids where needed. Expect the technician to inspect first and explain what species he is treating, because the answer changes the whole plan.
Insect growth regulators are the third tool worth asking about. They stop nymphs maturing and are the difference between knocking a population down and actually ending it. Their presence on a quote usually indicates a company that thinks in terms of elimination rather than repeat callouts.