Free DIY pest control guides

Middle half of 53 shared pro quotes to trap and seal: $1,400–$3,000. Supplies to do it yourself: $65.22.

Start here

Found droppings under the sink?

Pick what you found and we’ll take you to the right guide: what it is, how serious it is, and what to do tonight.

What did you find?

Small dark droppings on the floor of a kitchen sink cabinet
1 of 6
You found · Droppings
UsuallyMiceRatsCockroaches
First step: size and shape tell you whose they are.
How it works

From “what is that?” to handled.

One real case: droppings under the kitchen sink.

Droppings on a kitchen cabinet floor next to the pipes
A house mouse on a kitchen counter
Gloved hands setting snap traps along a baseboard
Gloved hands packing metal mesh around a pipe under a sink
Step 1 of 4 · What you found
What you found
Droppings under the sink

Rice-size, pointed, dark and shiny.

Fresh, so something is active nowCheck your own droppings

Where they get in.

A mouse fits through a gap ¼ inch tall. These are the four places to check first.

Cutaway of a house showing attic, kitchen sink, walls and foundation

Where soil meets the house. Any gap ¼ inch or bigger is a way in.

Fix: pack it with copper mesh, then seal with concrete or metal. Not foam.
Source: UC IPMHow to seal gaps

Pest Library

Know what it is?

Jump straight to the guide. These are the 12 pests people ask about most.

Find more in the Pest Library79 pages: pests, bites, droppings and other signs, with photos

Pests follow the calendar.

Now: Fall · October
A trail of ants on a kitchen windowsill in spring
SpringMar–May
Most active
Do this now
  1. 1Follow ant trails back to the entry point
  2. 2Sweep up winged insects and save one to identify
  3. 3Wipe crumbs off counters every night
General U.S. pattern; varies by regionIdentify a pest
Fruit flies over ripe bananas on a sunny kitchen counter
SummerJun–Aug
Most active
Do this now
  1. 1Empty standing water once a week
  2. 2Keep ripe fruit in the fridge
  3. 3Clean slow drains
General U.S. pattern; varies by regionGet rid of gnats
Leaves against a house foundation in autumn
FallSep–Nov
Most active
Do this now
  1. 1Where pipes, vents and cables come in
  2. 2Gaps under doors (mice fit through ¼ inch)
  3. 3Cracks in the foundation: use metal or concrete, not foam
Source: UC IPMHow to seal gaps
A pipe entering a house foundation in the snow
WinterDec–Feb
Most active
Do this now
  1. 1Check traps every day
  2. 2Store flour and grains in sealed jars
  3. 3Fix leaks under sinks
General U.S. pattern; varies by regionGet rid of mice

FAQ

Common questions

Straight answers, each with the guide to read next.

Still stuck?

Look it up by what you found, or send us a photo and a short description.

How do I know if it’s mice or rats?

Start with the droppings. Mouse droppings are about ¼ inch long; rat droppings are about ½ to ¾ inch. Where you find them helps too: mice and roof rats show up high, in attics and on top of cabinets, while Norway rats stay low, in basements and garages.

Rat poop vs. mouse poop
What’s the fastest way to get rid of mice?

Set several snap traps along the walls where you find fresh droppings, seal gaps wider than about ¼ inch, and put food away. Check the traps daily and keep going until a week passes with no catches and no new signs.

How to get rid of mice
Do ultrasonic repellents or peppermint oil work?

Not for long, so they’re not worth the money on their own. University extension services report that rodents get used to repeated sounds quickly, and no repellent has been shown to clear an infestation. Sealing gaps and trapping are what work.

Do ultrasonic repellents work?
Why isn’t my trap catching anything?

The usual causes are the wrong spot, the wrong size, too much bait, or a rat that’s wary of new objects. Move traps onto the route along the wall, use a pea-sized amount of bait, and for rats, leave traps baited but unset for a few nights first.

Why rats avoid traps
Is rat poison safe to use around pets?

It carries real risks. Pets can be poisoned by eating the bait or a poisoned rodent, and a poisoned rodent can die inside a wall. Snap traps are the safer first choice at home.

Rat poison dangers
How do I tell which bug bit me?

The bump alone rarely tells you: even doctors find bites hard to diagnose, as the University of Kentucky points out. Look at the pattern, where on your body the bites are, and where you were the day before, then confirm by finding the pest.

Bug bite pictures
What are the tiny flies in my kitchen?

Usually fruit flies around ripe fruit, fungus gnats from wet potting soil, or drain flies from slimy drains. Remove what they breed in first, then trap the adults that are left with a vinegar trap or yellow sticky cards.

How to get rid of gnats
Why are there small moths in my pantry?

They’re pantry moths, and the real problem is the caterpillars in your food. Find every infested package and throw it out in a sealed bag, freeze anything you suspect, clean the shelves, and keep dry food in containers with tight lids.

How to get rid of pantry moths
When should I call a professional?

Give trapping a fair run first: the CDC says to keep traps baited for at least 15 days, checking the bait every week. Call a pro if rodents are somewhere you can’t reach or clear, you can’t find how they get in, or fresh signs continue after that.

How to get rid of mice
Is doing it yourself really cheaper?

For most rodent problems, yes. Price guides list $189–$655 for rats, but 53 quotes homeowners shared for jobs that include sealing had a $2,000 median, middle half $1,400–$3,000. Snap traps, copper mesh, gloves and bleach come to about $57–$87.

Exterminator vs. DIY cost

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