I lived in a mobile home when I was in the army in NC and roaches took over the place, I called Orchid and they sprayed and nothing they came back... called them back and they sprayed some stronger stuff and I had to rush the wife and kid to the hospital later that day and then leave the doors and windows open for days to clear out the mess.
Roaches lay eggs on cardboard and brown paper bags so get rid of all that stuff you can or put them in tied plastic bags or containers. I live in the tropics and wild roaches enter the house every once and a while but don't sit up housekeeping because I have everything in plastic containers or in the refrigerator. Roaches love to go strait for the tooth brushes to suck out the water left in the bristles so put them in containers. Good luck!
"The man who reads nothing at all is better educated than the man who reads nothing but newspapers."
---Thomas Jefferson (or as Al Sharpton calls him: Grandpappy)