There has been construction work going on in nearby flats and cockroaches have infested my apartment. First, it was cockroaches crawling through the main door through the lobby.
These are the black kind (I believe they are oriental species). I used biokill in my kitchen and toilet. I don't see cockroaches around when they are sprayed but when my cleaner mops the floor with bleach and I do not spray again, they come back.
If anyone how how biokill works, will be happy to understand. Any tips on how to get rid of them without using professional pesticide services?