buy a can of Great Stuff or similar aerosol gap-filling foam and filling e.g. all the gaps around the pipes under the sink and EVERY other gap in the walls/baseboards (use caulk for long, thin gaps). check the furnace, water heater, and vents.
then all you have to do is kill the ones in your apartment, but no more will migrate in from your slob neighbors.
they make foam now with pesticide in it.
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