Anyone who has worked at a restaurant, bar, or combination of the two knows that pests like fruit flies, gnats, and roaches are no joke. Any sort of infestation can do damage to the business's reputation and can cause major drama with the Department of Health. While a bug here or there is something that's hard to avoid, if a bar or restaurant is overtaken by flies or visible roaches, things must be really, really bad. Any self-respecting business owner would call in professionals to handle a pe…