A resident that has been here for a little over a year recently reported that her apartment is overrun by cockroaches. Of course we had the exterminator out several times, provided the checklist of before/after and also followed up with gel treatment. In the several discussions with the resident I told her that she has to be proactive by removing food sources: pasta bags, rice-a-roni boxes, ripe fruit sitting on the counter, jars/bottles in the cabinets that have contents dried up on the side of the glass, toaster sitting on the counter that has breadcrumbs in it, clean the area around the stove that is covered with grease. It is literally sticky with grease buildup. She got upset at all this and I told her that it's not that she's messy it's that this is a food source. We even pulled out the stove and found all kinds of food stuff around/under it and cleaned it for her, including the top of the stove that was coated with grease. She said nothing had changed. So, we went a differet route and I went to home depot and bought $100 worth of cockroach killer stuff and had that placed all over the apartment.
While in there with the maintenance people, we noticed that she had done nothing to remove food sources - there was still food left out all over. I posted a letter on her door and explained that the cockroach bait may not be as effective as it could be because there is still alternate food available for them and said that open food should either be placed in an airtight container or the frig and the wall area around the stove should be cleaned with a degreaser - please do keep in mind this is not a difficult process as the backsplash is granite and porcelain tile - there is no opportunity for anything to saturate a material like this. I checked the surrounding apartments and none have reported cockroaches, but as a preventative had them baited - no cockroaches. I'm just at a loss of what to do next. At this point, I have no choice but to beleive that she introduced the bugs into the apartment, of course unintentinally. No one other apartments have reported bugs, and the resident with the problem won't cooperate because she's "offended" at the thought that it might have something to do with her. Quite frankly, I think it's much more offensive to have a cockroach crawling over your countertop than to be expected to cooperate.
Any suggestions on another step or how to deal with this resident to get her to cooperate?