Cockroaches are an annoying pest that invades your home and lives in cracks and other places. Insecticides are what most people use to kill these annoying and disgusting creatures though bug spray for cockroaches are quite hazardous to everyone because of the chemicals and poisons used to kill cockroaches. Insecticides are also very poisonous to small children too so I will tell you a safer yet simple option. You won't even have to go to a store for the safe roach killer solution.
You just have to simply get soap from bathroom or wherever and get a spray bottle or just a normal bottle and fill it with water and some soap into a mixture. Don't go mixing your whole chunk of soap since it you just need a light amount and the chunk will take too long to dissolve. When you see a roach spray the whole body and the roach will be unable to breathe. This is because the soap water creates a layer over the pores of the roach effectively killing it.
Or you can just simply splash soap water on the cockroach which is also effective so the mess will only be a dead cockroach though sometimes they live so I suggest throwing the cockroach down the toilet and not the trash can and some soap water on the floor. So you just have to soak up the water with towels or a rag. Such a simple and money saving option than poisonous insecticides.
Vic