To really cure this problem, you need to be in a place you are going to stay for awhile. If you’ll only be there for a month or two, you might just want to find a different place. Otherwise it is not labor or cost effective. This method got rid of 100% of the cockroaches in at least one apartment without exposure to toxic pesticides. Use the barrier method. It may not be 100% effective in preventing pregnancy but it works pretty damn good for roaches. Basically, roaches live in the walls, you don’t, so decided not to care if the roaches do. Stop them from coming out into your side of the apartment (outside the walls).
Make sure to caulk between each cabinet box where it butts against the next cabinet. Also get up on the counter and check the top side of the cabinets and seal it off up there, too. Look inside your cabinets and seal any openings on the back wall. Make sure the sink is sealed to the countertop. If you find any major holes use expanding foam to fill them. That stuff is ugly, so if it is exposed, make a plan to fill the space that looks better than the foam. [4] X Research source A secret opening the cockroaches know about but you don’t is the gap between the countertop and the cabinet box on the underside. Take out all your stuff and caulk that baby good! Do all the cabinets on all sides in your whole kitchen.
After you’ve resolve the bait issue, every single switchplate and outlet cover of any type must be must be taken off, caulked around the inside edge and stuck back on (wipe off any extra that oozes out). You might think they’d come through the prong openings on an outlet but there is not really much access. You can use the plug covers if that bothers you.
If the fibrous acoustic tiles do not have holes in them, either paint the whole thing to seal between the panels and the metal hanging strips, or lift each panel,caulk around it and set it back down.
