Cockroches can be a very discusting little pests, that is high humidity or very wet areas will appear all the time. Having cockroaches does not mean that your home is dirty (in some cases it does but) lots of water near your home and warm temperatures are a drawing factor for cockroaches. To keep cockroaches from bothering you, use a few Hedge Apples cut up and placed around your home to keep the cockroaches at bay.
Keeping all your food in containers, where they can smell or get to your food will be important.
You can make a mixture of cocoa, flour, and borax, sprinkling it around the floors will keep cockroaches from coming back (this is poison that you can't use with children or pets!)