Feed
Mortein into your comp
This firm makes stuff that will get rid of anything, I dont like using chemicals but sometimes you have to. If you have tiled floors and can bleach them now and again and have aircon chances are you wont get cockroaches, they are after crumbs of food so the cleaner things are theres no free lunch for them, most houses have fly screens. As most places dont get frosts they dont get killed off like in the UK, the hoovers very good for catching flies wherever you are.