You should do some light cleaning and preparation before an exterminator comes, but you should not do a deep deep clean that removes evidence of pests, because the technician needs to see where pests are active to treat effectively. For general pest control for ants, cockroaches, and rodents, pest control companies recommend picking up clutter, vacuuming floors and crumbs to reduce competing food sources so baits work better, wiping down kitchen counters, and storing food in sealed containers. You should also pull furniture slightly away from walls to allow access to baseboards, clear under sinks, and provide access to attics, basements, and crawl spaces. However, do not mop with strong cleaners right before treatment or wash away droppings, grease marks, or trails, because those signs help the technician identify species and entry points. For bed bug treatments, preparation is more extensive, including washing all bedding and clothing in hot water and drying on high heat, vacuuming mattresses and floors thoroughly, reducing clutter, and bagging items, with specific instructions provided by the company. For cockroach treatments, avoid using over-the-counter sprays for a week before, as they can contaminate baits. For rodent visits, note where droppings are found. In general, a tidy but not sterilized house with evidence visible allows the exterminator to inspect accurately and apply treatments where needed, and they will give you post-treatment cleaning instructions to avoid removing products too soon.
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