Tool works on contact, so it should be sprayed in the nests of cockroaches on the "tracks" of ants, etc. One spray can not do, but the bottle is huge - enough for a very long time! In addition, it is a tremendous advantage of security - you can spray on a meal, it is safe for children and pets, although there it is certainly not worth it). I got rid of the food moth spraying kitchen cabinets, my grandmother brought cockroaches, against which a tool like the raid and raptors were powerless. Highly recommend! ******* If the review helpful, please click, YES! Thank you! More comments on my page. Good luck with your shopping!