My building management company is asking me to prep my kitchen for a third roach treatment since May. This is because I saw/reported one roach 15 days after the second treatment.
I am asking them to consider a more comprehensive approach. (My third floor unit connects to four other units next to and below me, with an interior stair-well on the other side.)
Also, I saw/reported one roach in the second floor stair-well days before the aforementioned sighting.
To me, one roach in the second floor stair-well indicates that this infestation is more widespread.

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