Clean the storage shelves and drawers thoroughly, clean under refrigerators, sinks, stoves and vents as well. Wipe up crumbs regularly, and wash dishes immediately after use. If you can t get to the dishes, submerge them in soapy water. Recycle your old newspapers and get rid of old clothes, books and furniture. Vacuum out cracks and crevices, and then seal up these areas with caulk.
Place screens around heating or cooling vents, and caulk around the edge of the screen.
Weather-strip around doors and windows and areas near pipe entry points. A diligent approach to monitoring and the steps described above will generally bring your roach population down to a negligible number. Sometimes, however, these steps are not enough. In these cases, other least-toxic tools can be employed. If non-toxic, these can be used in areas where food is stored.