The topic is funny. However, you can reduce their population by thoroughly cleaning up every nook and cranny of your house--let's say once a week.
If you already have them running around your house in a discussing way then an insecticide would come in handy
I also hate cockroaches. use repellent and some other sprays available in market, like mortein cockroach killer, baygone spray, finish cockroach spray and other. Try to make a site clear where u see cockroaches mostly.
Spray soap water on them. Believe me, it works! This is the cheapest and effective way to kill cockroaches. Spraying aerosol could be injurious to health. But be careful, soap water is slippery.
squeeze them using your hands, and you will feel the cracking sound of it and the juice will come out from its tommy... yummy !!! ^_^
bomb them.. kidding.. I'll explain it to.. there is a very simple step wise method but you need to follow the steps as they are.. first get hold of some tear gas shells and a mask for your self fire the shell and roaches will start crying and beg you for mercy.. do not trust them.. get hold of their tentacles and dip them in water.. well, some might know how to swim.. rest will drown.. now you are left with say 30 % of the roaches.. make them eat some food with poison added to it.. while they are busy munching.. get hold of a tactical shotgun.. and take the aim... still some might run away.. quarantine your house and let them starve to death.. thats how you kill cockroaches... I advise you to never try this at your own home.. first give it a try at your neighbor's.. lolllzz ona serious note.. no offence was meant to the OP and others too nice topic.. and interesting replies too..
cockroach has this immune system that once it survive from a baygon/insect spray, their sibling will now be immune to it and thus manufacturers have to figure out another elements for it to be effective. bestwy is to step on them..
Nothing better than sprays. But you also have to spend your time to look for their "houses" and destroy them. Otherwise, you will have to spend million dollars buying spray. lol Good luck.
Spraying insecticides is the best mess-free solution to getting rid of cockroaches. I am little surprised that you are living in China and yet, you are not aware of people eating them! I have heard from friends about Chinese people eating them....though I am not sure if it is really true or false! Regards, RightMan