I have found a final solution for the tiny ants and cockroaches. A a small paper tube of ant and roach killer where you peel back the paper and drop a white powder. Cheap and works great. We put some in front of our refrigerator door and culled a large number of the little ants and two cockroaches. Cockroachs lay their tiny black eggs in the corners of our food cubboards. We wash those out. I get more ant bites than mosquito bites.