Roaches will not automatically leave a clean house on their own because they can survive in spotless, well-maintained homes if moisture, warmth, and shelter are available, though thorough cleaning reduces food sources that support large populations and makes infestations smaller and easier to control. German cockroaches, which are small light brown about half an inch with two dark stripes common in kitchens, and American cockroaches, large reddish brown about one and a half inches often called palmetto bugs, can enter clean homes through cracks as small as 1/16 inch around windows, doors, pipes, and foundations, through drains and sewer lines, and by hitchhiking in grocery bags, cardboard boxes, used appliances, and luggage, regardless of cleanliness. They are attracted to moisture from leaky pipes, condensation, pet water bowls, and warmth from appliances like refrigerators and dishwashers, so even clean homes with moisture problems can support roaches. Additionally, roaches can migrate from neighboring apartments through wall voids, so apartment dwellers may have roaches from neighbors despite keeping clean. While cleanliness alone does not make roaches leave, it removes competing food sources that allow colonies to thrive, so clean homes may have fewer roaches and smaller infestations that are easier to eliminate with baits. To make roaches leave a clean house, you need to combine sanitation by storing food sealed and cleaning crumbs, with moisture control by fixing leaks, exclusion by sealing cracks with caulk, and targeted gel baits containing fipronil or hydramethylnon that roaches carry back to kill colony within days to weeks, plus professional pest control costing $150 to $400 for severe cases.
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