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Signs of a rodent infestation

Rodents don’t need a big opening to get inside. Mice can squeeze through holes as small as a dime, and once inside, they look for food, water, and a place to hide. Most of the time, they stay out of sight. But they leave behind signs that they’re there.

At Presto-X, we know rodents can cause damage fast. That’s why it’s important to catch the problem early. If you think you might have rats or mice in your home or business, here’s what to look for.

What are the signs of a rodent infestation?

Rodents are routine-driven animals. They move along the same paths every night, return to the same hiding spots, and often create a trail of clues. Some signs of a rodent infestation include: 

Bite marks or chewed-up materials

Rodents need to gnaw constantly to wear down their teeth. That means they chew through food packaging, cardboard boxes, furniture, drywall, plastic pipes, and even electrical wiring.

You might notice small holes in cereal boxes or shredded packaging. You could also find gnaw marks on baseboards, cabinet corners, or cords. In a warehouse or restaurant, watch for chewed storage containers, bags, or food prep areas.

Chewed wires can be especially dangerous. They increase the risk of fire and can cause expensive equipment damage.

Strong smells that won’t go away

Rodents leave behind a very distinct odor. It’s a musty, ammonia-like smell caused by their urine and scent trails. These smells help them find their way back to food and nesting spots.

The odor may start off faint but get stronger over time, especially in small or enclosed spaces. You might smell it inside cabinets, closets, crawlspaces, or anywhere that hasn’t been cleaned recently. If the smell persists, even after cleaning, rodents may still be active in the area.

Smudges on walls or floors

As rodents travel along walls or squeeze through openings, their fur leaves behind greasy smudges. These marks may appear as dirty streaks or dark patches along baseboards and doorframes.

These grease trails help technicians figure out where rodents are coming from and how they’re moving around the building. In high-traffic areas, the smudges can build up over time and become more obvious. You may also notice small footprints or tail marks in dusty areas, such as basements or behind furniture.

Droppings near food or hidden areas

Rodent droppings are one of the first things you might notice. They’re small, dark, and pellet-shaped. Mouse droppings are usually about the size of a grain of rice. Rat droppings are larger and more rounded at the ends. You’ll often find them where rodents travel or nest. That includes behind stoves, inside pantries, under sinks, or along walls in garages or basements. In a commercial space, check break rooms, storerooms, and loading areas.

Fresh droppings are a clear sign that rodents are currently active in the building. The more droppings you see, the bigger the issue may be.

A gray rat near a wooden wall on the floor

Why these signs matter

Rodents can chew through expensive materials, spoil food, and carry harmful bacteria. In some cases, they can even trigger health violations or shutdowns for commercial spaces.

One rodent can turn into many in just a few weeks, which is why it’s crucial to take action as soon as you see the warning signs. Delaying can make the problem worse and more costly to fix.

Call Presto-X if you notice rodent activity

If you’ve seen droppings, heard scratching, or found a nest, it’s time to call a professional. Our Presto-X technicians know how to find the source of the problem, identify what type of rodent you’re dealing with, and stop the activity at its roots. We don’t just place traps; we identify entry points, track movement, seal problem areas, and create a customized plan tailored to your specific space.

Whether you’re dealing with rodents in a home, warehouse, restaurant, or office, we can help you take back control. 

Frequently asked questions

The most typical signs include small droppings, chewed materials, and strange scratching or squeaking noises, especially at night. 

You might also notice strong smells, greasy marks along walls, or shredded paper and fabric used for nesting. If you’re seeing more than one of these signs, rodents are likely already inside.

It depends on how severe the problem is. A small infestation might be handled in a few visits. Larger issues, especially in commercial buildings, may take longer and require ongoing monitoring. The sooner you catch it and call for help, the faster it can be solved. 

Our technicians create a custom plan to target the problem at the source.

Look for physical signs like droppings, chewed packaging, nests, or dirty smudges on walls. Listen for nighttime noises like scratching or squeaking. If something smells musty or off in certain areas, that could also be a clue.

If you’re finding signs in multiple areas, smelling strong odors, or seeing live rodents during the day, you may be dealing with a rodent infestation. Rodents are adept at hiding, so even a single sighting may indicate the presence of many more nearby. A professional inspection is the best way to know for sure.

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