Go to HOME DEPOT and get a can of BENGAL Roach spray. About $15, but works. It is a clear, odorless, non staining dry aerosol with a straw similar to WD-40. Stick the straw in cracks under sink, beneath fridge, etc and watch them come out of places you don't know they exist. Do this a couple of times a year and you won't see any. When I moved here, I rented and the place had the large ones due to oak trees and being closed up. The owner wanted to call a service, but I told her I would handle it with the Bengal. Never saw another after treating it. Best of luck...
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