They have 4 stages, 2 of which - eggs and pupae - no insecticide can kill.

Therefore, MG Pest Control focus on treating all the floor areas as much as we can access. A good residual insecticide, which once dry - continues to kill the adults trying to get to you. This works for several weeks after treatment. You can't vacuum or clean the treated areas though - for several weeks. Just a light dust pan. Often one spray is enough - but sometimes more are needed, if it's a heavy infestation.