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with a contact poisons/sprays, and residual sprays which leave time released ingredients in your cupboards and on the surfaces where sprayed, that will work pretty quickly and continue to work over 3-4 weeks. The problem with this is that you set these off and leave the house for a few hours. You will return to several dead roaches and the smell.
you can also take preventative measures, such as sprinkling powdered boric acid in between walls, and around foundations where they may have entered the house. This is generally a safe product and will be carried on the roach’s feet, to wherever they are hiding and breeding.
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