Below is a small experiment that i am thinking, for killing cockroaches almost no mess in kitchen
I guess there should be someway to create a small box (death home) for cockroaches, where we should place lavish food for cockroaches (less costly for us), (like flour, cocoa powder, water, etc. ?), so that we leave it at the sink or some place where the water, etc., i.e; the place where cockroaches are seen or mostly could be.
Assuming all the above is possible, the small box or something should be a special kind, such that, it should be entry-only (i.e; the cockroaches should be able to enter, but not exit, at all), i guess this is too possible some, like say a “thinned” poker card (? the ace or joker card, etc.) should be at the mouth/entry of the box, the peeled card should be such that cockroach can move to enter easily, however while exiting this should not be possible, as after entry the card closes of the entry gate (which is the exit gate too).
In this way, the cockroach enters but can’t exit, and these can be seen in the morning, and be killed (if borax is added to food, as suggested by Cecil)
of course, there is a possibility of exit of an existing cockroach (say 50-50% chance or less), while another one is entering (for example a small hole may not allow a big cockroach to enter, so the size should be big enough for a bigger cockroach to enter, if so when a small cockroach enters, there could enough space for another even smaller cockroach to exit), however this can be eradicated by having a little taller box, where the entry is at an elevated position, the outside is normal surface where the cockroach can climb up, and enter into entry, however the inner surface should be a slippery for cockroach so that they cannot climb up to the exit
this idea needs experiment & validation, please add to the post, changing all but the plan itself, :), for example, food, what should be slippery material for inside surface, etc. etc.
All i want is a clean kill of cockroaches, making very very less mess in kitchen.
I am thinking to implement above experiment, and post results here
Meanwhile, would be great if Cecil can provide some insights if the plan is ok to implement at all, and changes to this plan.