Why Clean Homes Still Get Pests

Is a pest problem a sign of a dirty house?

No. Dirt can make a problem bigger, since crumbs and grease feed cockroaches and ants. But pests do not check how clean your kitchen is before they enter. They respond to temperature, moisture, hiding places and access.

Bed bugs are the clearest case. They feed on blood and are not drawn to dirt, which is why they turn up in tidy homes, hotels and apartments alike. Mice in the cold months look for a warm cavity, and a quiet wall void is as good as it gets, however clean the kitchen.

How do pests get into a clean home?

Most entries are small and boring. Look for these first:

• Gaps around pipes and utility lines. Openings where plumbing, gas or cable enter the house are common. Columbus Health Code §221.03, as Columbus Public Health cites it, calls for sealing any opening of half an inch or more within 48 inches of ground level.
• Door and window edges. A worn sweep or cracked weatherstripping leaves a path for ants, spiders and mice.
• Garage and foundation. Garage doors that do not meet the floor and cracks in masonry are quiet highways.
• Vents, chimneys and the roofline. Unscreened openings let insects and rodents reach the attic.
• Deliveries and secondhand items. Cardboard, used furniture and luggage can carry insects in.

What does a seal-up walk-through look like?

Do this on a dry day with a flashlight, starting outside at ground level:

1. Walk the foundation and look at every spot where a pipe, gas line or cable enters the wall.
2. Close each exterior door and look for daylight under it or at the corners.
3. Check window frames, the chimney base and the fascia board under the roofline for cracks.
4. Look at the garage door seal and the garage corners where the door meets the floor.
5. Inside, open the cabinet under each sink and check the pipe collar.

Ohio State University Extension recommends silicone or silicone-latex caulk for small cracks around doors, windows, chimneys, utility pipes and fascia. Mouse-size gaps need rodent-proof material such as metal mesh, since mice chew through foam. In older communities such as Bexley, where the median home was built in 1944 (ACS 2019-23), settling alone opens gaps that no amount of scrubbing closes. Our pest exclusion work is the professional version of this walk.

Why do pests move in when it turns cold?

Ohio winters push mice and several insects toward heated buildings. Stink bugs, boxelder bugs and lady beetles squeeze into wall voids to ride out the cold, and mice look for nesting spots near a food source. A home that is warm, dry and sealed poorly will collect them regardless of how it looks inside.

That is why activity often spikes in fall. The same house that had no trouble in July can have a steady stream of visitors by November. A pest inspection in early fall finds the openings before the weather forces the issue.

Can pests hitch a ride into a clean home?

They can, and this is the route people overlook. Bed bugs ride in on luggage, coats and secondhand furniture. Cockroaches arrive in cardboard boxes and grocery bags. Fleas come in on a pet, a visitor's clothes or a used rug.

None of these trips depend on how you keep house. If you travel or buy used, inspect seams and corners before things go into the bedroom, and read about our bed bug control if you already suspect a hitchhiker.

What does a clean home still miss?

Clean does not mean dry, sealed or closed to food. These are the blind spots we find in tidy houses:

• Moisture. A slow leak under a sink or a damp basement draws roaches, silverfish and ants even when the counters shine.
• Pet food and trash. A bowl left out overnight, or a recycling bin with unrinsed cans, feeds ants and roaches that came in through a gap.
• Pantry packages. Flour, rice and pet food in paper or thin plastic let stored-product pests spread. Lidded containers stop that.
• Cardboard storage. Boxes in a basement or garage give roaches and silverfish both food and shelter.
• Outdoor edges. Mulch against the siding, firewood stacked on the wall and branches touching the roof give pests a bridge.

Fixing these is housekeeping, and it does help. But it works alongside sealing, not instead of it.

Can your neighbors cause your pest problem?

Yes, especially in attached housing. Cockroaches, mice and bed bugs travel through shared walls, pipe chases and floors. You can keep your own unit spotless and still get visitors from next door.

In Columbus, the owner of a dwelling with two or more units is responsible for eliminating pests, according to Columbus Public Health. If you rent, tell your landlord in writing. Our residential pest control page covers how we approach multi-unit homes, and a building-wide treatment often beats unit-by-unit chasing.

What actually keeps pests out of a clean home?

Cleaning is the first half. Exclusion is the second. Exclusion means sealing the openings pests use so they cannot get in at all.

Does a clean home need a recurring pest plan?

Often not. If the cause was one gap or one hitchhiker, a single inspection, a treatment and the sealing is the whole job, and a one-time visit fits. Paying for a standing schedule on a house with no repeat pressure is money for nothing.

A recurring plan earns its keep when the pressure is built in: an older home with settling foundations, an attached unit with neighbors you cannot control, or a house beside woods or water. In those cases pests come back because the surroundings send them, not because you missed a spot.