Hit Insect Repellent
Most of us who use regular solution (boric powder, chalk) to get rid of the cockroaches often complain that it is impossible to kill the cockroaches that are hidden in difficult corners and cervices of the kitchen/bathroom. Therefore we simply ignore them.
Sometimes even eliminating visible cockroaches becomes difficult as they run and hide in places that can't be reached by a regular solution like chalks, boric powder etc. And cockroaches being nocturnal will get out of it's hiding place in the night and contaminate any exposed food, utensils etc.Spreading bacteria thus causing food poisoning. Hence it is extremely imortant that we kill hidden cockroaches.