You could implement cockroach dust obtainable in the form of boric acid to kill them instantly. You may make a solution of baking soda and sugar to draw in and kill the cockroaches. Oriental Cockroaches: Also they are named black roaches or drinking water bugs. Oriental cockroaches are extremely toxic. https://zanevbaws.blogdomago.com/27232482/cockroach-control-sydney-for-dummies