I also have the same problem. Last night I killed 4 at dining room and 5 at kitchen with my slippers.
Want to ask about biokill. If I use biokill in the kitchen,
(1) do I have to close all the windows first?
(2) do I have to hide away all dishes/plates/cups/fruit first?
(3) there is washing machine, microwave and stove in the kitchen, will they explode if I use them after using biokill?