Rats or Mice in the Holiday Boxes? Check Before You Decorate

The tree goes up this weekend. The decorations have been behind the beach chairs, on the garage shelf or up in the attic since January, and nobody has touched them since.

Most homes in Miami-Dade, Broward and Palm Beach counties don’t have a basement, so the garage and attic do all the storage work. That means eleven months in a hot, dark, quiet corner with cardboard, tissue paper and newspaper to chew. Rats and mice know it. A box of ornaments wrapped in newspaper is a ready-made nest.

November is when people finally move those boxes and find out what’s been living behind them. Check before you carry anything inside. It takes a few minutes and keeps droppings off the living room floor and chewed lights off the tree.

Quick answer: how to check holiday boxes for rodents

1. Leave the boxes where they sit and check the floor, shelf and wall around them with a flashlight.
2. Look for droppings, chewed corners, shredded paper balled into a nest, a sharp urine smell and greasy rub marks.
3. If you find signs, don’t sweep, vacuum or shake anything. Air the space out, glove up and wet the mess with disinfectant first.
4. Throw out chewed light strands and any cardboard with droppings or urine on it.
5. Find how they got in before next year: the garage door seal, utility line gaps and the attic.

Start with the floor, shelf and wall

Leave the boxes where they are while you look. Use a flashlight, even in daylight, and check the floor under them, the shelf behind them and the wall they sit against. Don’t reach blind into a dark corner.

What to look for:

• Droppings. Small, dark pellets on the shelf, the lids or the floor nearby. Mouse droppings are about the size of a grain of rice. Rat droppings are bigger, closer to a raisin. Size is a rough guide, not a sure ID, and looks alone won’t tell you how old they are. Our guide to common signs of mice and rats goes deeper on telling them apart.
• Chewed corners and holes. Rodents usually chew in at a corner or a seam. A ragged hole with bits of cardboard on the shelf below is the giveaway. Check the contents for more damage. One chewed corner won’t tell you how many rodents you’re dealing with.
• Shredded paper, tinsel or tissue balled up. A tight bundle of packing material, especially with droppings around it, is likely a nest. Don’t pull it apart to see what’s inside.
• Gnawed light wires. Bite marks, split insulation or bare copper on a light strand mean it’s damaged.
• A sharp, musty smell. Rodent urine has an ammonia smell you notice when the lid comes up. Smell alone isn’t proof, but take it seriously when you see other signs. Don’t put your face into a box to sniff.
• Greasy dark smears along the wall, shelf edge or near pipes. Rats run the same path over and over, and the oil from their fur leaves a mark. Plain dirt can look similar, so read it alongside droppings and chewing.

One old dropping on the floor doesn’t mean you have rats today. A chewed box with fresh droppings and a nest inside does.

Rats in the garage, roof rats in the attic

In South Florida the rodent in your attic boxes is often a roof rat. Roof rats climb. They come in at the roofline, through gaps at the eaves, vents and soffits, and work their way down. Boxes stored in the attic are often their first stop, and the attic hatch can connect them to the garage or the house.

Mice and rats in the garage usually walk in at ground level, under a worn door seal or through gaps around pipes. If you find droppings both in the attic and the garage, you may have more than one way in. Read more about protecting your attic from roof rats.

How to open and clean the boxes

If you spot droppings or nesting material, stop decorating for now. Keep kids and pets away. Don’t shake the box, blow dust off the lid, or carry it through the house.

Air it out first. In a garage, open the big door and any side door for about 30 minutes before you clean, and step away while it airs out. That’s the CDC’s advice for closed-up spaces. Don’t aim a fan at the mess.

Attics need judgment. If reaching the boxes means crawling over droppings in the insulation or balancing between joists, stop there and call us. The same goes for heavy droppings, more than one nest or a strong smell.

For a small mess you can reach:

1. Put on rubber or plastic gloves.
2. Spray the droppings, urine and nest material until they’re soaking wet. Use a household product with the word “disinfectant” on the label, or a fresh bleach mix of 1 part bleach to 9 parts water. Never mix cleaning products.
3. Let it soak for 5 minutes or the contact time on the label.
4. Wipe it up with paper towels and bag it. Double-bag nests.
5. Wipe the shelf and floor underneath with disinfectant.
6. Wash your gloved hands with soap and water before you take the gloves off, then wash your bare hands.

Don’t sweep or vacuum droppings or nesting. Dry cleanup kicks contaminated dust into the air, and breathing it in is the main way rodent-borne disease reaches people. The CDC’s rodent cleanup guide covers the full steps, and our post on how rodents threaten your health explains why it matters.

Once the outside of the box is clean, take it outside or to the open garage door. Open the flaps slowly without tearing or shaking them, and keep your face back. If you find a nest, a lot of droppings or a live rodent inside, stop and get help.

What to keep and what to throw out

The cardboard box goes. Cardboard soaks up urine and you can’t really disinfect it. The CDC says to throw out cardboard boxes with urine or droppings on them. Bag it whole rather than breaking it down and scattering debris.

Hard ornaments can usually be saved. Glass, metal and hard plastic can be wiped with disinfectant, following any care instructions.

Fabric goes in a hot wash. Tree skirts and stockings that are only dusty go in hot water with detergent and a hot dryer. If they’re chewed or soaked, throw them out.

Porous stuff that’s soaked goes in the trash. Tissue paper, felt ornaments and packing paper with urine on them aren’t worth saving.

Electrical decorations stay dry. Don’t spray light strands, plugs, sockets or anything with a cord. Set questionable ones aside.

Chewed Christmas lights go in the trash

Run every light strand through your hands before you plug it in, including the sections tucked inside wreaths and garlands. You’re feeling for bare copper, nicked insulation or a cord that’s been flattened and gnawed. A strand that still lights up can still be damaged.

If you find any, throw that strand out. Don’t plug it in “just to check,” and don’t wrap the bite marks in electrical tape. Chewed insulation is a shock and fire risk, and a set of lights isn’t worth it. Keep the tossed strands separate so nobody pulls them back out of the pile.

While you’re at it, check the wiring near where the boxes were stored. If they chewed the lights, they may have tried the garage door opener cord or the wires running up into the attic. Here’s more on how rats damage home wiring.

Where they’re getting into the garage

Rodents found the boxes because they found a way in. The usual spots in a South Florida garage:

• The garage door bottom seal. A worn seal, a chewed corner or an uneven threshold leaves a gap. With the door closed, look for daylight under it and along the sides.
• Gaps around pipes and lines. The water heater lines, washer hookups, cable lines and the AC lines where they come through the wall. Check behind shelving too. Rodents chew through spray foam alone, so repairs need materials made for the job.
• The attic hatch or pull-down stairs. The hatch is usually the path between spaces, not the way in from outside. Roof edges, vents and soffit gaps are where roof rats get into the attic in the first place.
• Open side doors and pet doors. Simple, and easy to forget.

Make sure nothing is still living inside before you seal anything. Sealing a rat into a wall or attic creates a bigger problem than the one you started with. Here’s what rodent exclusion usually includes.

Pack differently after the holidays

When the decorations come down in January, skip the cardboard. Use sturdy plastic bins with lids that snap shut. They aren’t rodent-proof, but they’re much harder to get into than cardboard and easier to check.

Drop the newspaper and tissue. Bubble wrap or old towels in a sealed bin give rodents less to shred. Store bins up on a shelf with room to see behind them, not stacked tight against the wall.

Keep pet food and birdseed in sealed containers away from the decorations. Clear the clutter around the garage door and utility lines so fresh chewing or droppings are easy to spot. The same habits help in the guest room closet. See our guest room pest check before holiday visitors.

Holiday box rodent questions

Are these rat or mouse droppings?

Mouse droppings are about the size of a grain of rice. Rat droppings are closer to a raisin. Size helps, but it’s a rough guide. Where you find them, how many and what else is chewed tell you more.

Can mice and rats chew through plastic storage bins?

Yes. A plastic bin slows them down and keeps nesting material out of reach, but a determined rat can chew through plastic. Bins work best on a shelf, with the space around them kept clear so you’d notice chewing early.

Why do rats and mice chew Christmas lights?

Rodent front teeth never stop growing, so they gnaw on almost anything, and cords are an easy target. A strand stored in a box all year is just something in the way.

What disinfectant should I use on mouse droppings?

The CDC says to use a household product labeled “disinfectant” or a fresh mix of 1 part bleach to 9 parts water. Spray until it’s soaking wet and let it sit 5 minutes or the time on the label before you wipe.

Should I throw away decorations mice got into?

Throw out the cardboard, chewed light strands, and soaked tissue, felt or fabric. Hard ornaments can be disinfected, and lightly dusty fabric can go in a hot wash.

Does one dropping mean I have rats?

Not always. One old dropping is a reason to look closer. Fresh droppings in more than one spot, a nest or new chewing means rodents are active.

When to call a pro

Call us if you find:

• Fresh droppings in more than one box or more than one spot
• A nest inside a box, or chewed wiring anywhere in the garage
• Droppings or nesting in attic insulation you can’t easily reach
• Scratching in the ceiling or walls at night
• Droppings showing up again after you cleaned

That usually means rodents are living in the house, not just passing through the garage. Trapping a few won’t fix it if the way in stays open. Read whether trapping mice is enough. Our rodent control service starts with an inspection that looks past the chewed box to the entry points, travel routes and whatever is drawing them in.

Decorating in Miami-Dade, Broward or Palm Beach County and found signs in the boxes? Book a rodent inspection before the decorations come inside.