A friend of mine is a pest control specialist that gets rid of bed bugs. He says that he does it by a) providing the owner/tenant with a set of preparation instructions that are 12 steps on four pages, and b) going to the apartment 3 times in the space of 6 weeks and spraying every single crack big enough to catch a piece of paper with chemicals. The three visits catch the eggs that hatch out after the first treatments, before what hatches mature enough to lay their own eggs. Cheap, no. Effective, yes. He says that his business has skyrocketed.
Wow. Unbelievable. Welcome to third world living.