Best Indoor Pest Control Sprays: Residual, Aerosol, Plant-Based

The best pest control spray for indoors is Ortho Home Defense MAX, an odor-free residual spray for baseboards, cabinets and entry points that keeps working for months on non-porous surfaces. TERRO's T2302 aerosol is the budget can for cracks and crevices, Harris is the odorless liquid for bedrooms, Orange Guard is the d-limonene option for kitchens, and Safer Home kills on contact with plant oils.

Should You Spray for Pests Inside the House?

Sometimes, but it should not be the first step. University of California IPM's guide to understanding pesticides recommends identifying the pest, using non-chemical methods such as sealing gaps and removing food and water, and then choosing the least toxic product that solves the problem. Indoors, it adds, use only pesticides specifically labeled for use inside the house.

When a spray is needed, the goal is to put a small amount exactly where insects walk and hide: the gap behind the stove, the edge of the kitchen floor, the back of the sink cabinet, around pipes and along door frames. That keeps insecticide off the surfaces people and pets touch while still reaching the pests.

Treating the outside of the house as well? Our roundup of the best pest control sprays for the home compares perimeter concentrates and lawn granules, and the wider collection of spray guides explains which sprayer to mix them in.

Residual, Contact and Plant-Based Indoor Sprays

A residual spray for edges plus a can for the insect on the wall covers most homes; plant-oil sprays fill in where you would rather not use synthetics.

How We Selected These Products

We compared indoor pest sprays on whether they are labeled for indoor use, the pests they list, how long they keep working, odor and staining, and what buyers report. Our sources were the makers' listings, Amazon's review digests and UC IPM guidance; we did not test the products.

We favored products that list common household pests, including a residual spray, an aerosol, an odorless liquid and two plant-based choices. We left out sprays whose buyers mostly report poor value, broken sprayers or no effect, and listings with few ratings and unsupported claims. Every pick here is labeled for use inside the home and lists at least the common crawling insects.

Ortho Home Defense MAX: Best Overall Indoor Pest Control Spray

Inside the house, Ortho Home Defense MAX does the routine work: two 24-ounce trigger bottles of odor-free spray for the edges of rooms.

• The maker says it controls ants, roaches and spiders indoors for up to 12 months on non-porous surfaces.
• It also lists stinkbugs, centipedes and other home-invading insects.
• It is non-staining, per the maker.
• Buyers find it effective on a wide range of indoor pests and like that it has no odor; value opinions are mixed.

Choose it for baseboards, behind appliances, under sinks and around door and window frames. Apply a narrow band along the floor edge, keep children and pets out until it dries, and leave countertops, dishes and food-prep areas untreated. On tile, vinyl and painted trim the residue lasts longest; on bare wood, concrete and carpet edges, expect to retreat sooner.

OUR CHOICE

Ortho Home Defense MAX Insect Killer 24 oz 2-Pack

SprayOdor-free2 bottles

Best for: Long-lasting edges in every room

• ✓Up to 12 months on non-porous surfaces, per the maker
• ✓Odor-free and non-staining, per the maker
• ✓Effective on many indoor pests, per buyers
• −Shorter residue on porous surfaces
• −Mixed value feedback

Editor's Note

It handles routine indoor pests with no odor. Spray a narrow band along floor edges and entry points.

Check Price

Specifications (3)

Liquid Volume

24 fluid ounces

Item Form

Spray

Target Species

Insects

TERRO T2302 Insect Killer Aerosol: Best Budget Spray for Cracks

TERRO's two-pack is the inexpensive aerosol for the bug on the wall and the crack it came from: two 16-ounce cans of pyrethrins and deltamethrin.

• It lists spiders, ants, cockroaches, crickets, scorpions and other insects.
• It kills on contact and is labeled for surface, spot and crack-and-crevice treatment indoors and outdoors.
• Buyers find it effective, especially on spiders; spray performance and value are mixed.

Choose it for the occasional roach, cricket or spider and for spraying into cracks behind baseboards and around pipes. Ventilate small rooms after using an aerosol, and keep it away from food and pet dishes.

BUDGET PICK

TERRO T2302 Insect Killer Aerosol 2-Pack

Aerosol2 cans

Best for: Cracks and insects you see on a budget

• ✓Lists spiders, ants, roaches and crickets
• ✓Fast knockdown, per the maker
• ✓Crack-and-crevice use indoors and outdoors
• −Some cans do not spray well, per buyers
• −Little effect on insects you miss

Editor's Note

It is the household can for cracks and the bug on the wall. Ventilate small rooms afterward.

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Specifications (3)

Size

16 Ounce (Pack of 2)

Item Form

Aerosol

Scent

Unscented

Harris Odorless Insect Spray: Best for Bedrooms and Living Areas

Where any smell would bother you, Harris's two 32-ounce trigger bottles of deltamethrin liquid are odorless and non-staining, per the maker.

• Though sold as a spider killer, it also lists ants, roaches, Asian lady beetles, crickets and silverfish.
• It is registered with the EPA for indoor residential use, and keeps killing once the spray has dried, per the maker.
• It will not damage fabrics when used as directed, per the maker.
• Buyers report it eliminates spiders; value gets mostly negative reviews.

Choose it for bedrooms, closets and living rooms, applied along baseboards and window frames. Let it dry fully before children or pets use the room.

Harris Odorless Insect Spray 32 oz 2-Pack

DeltamethrinTrigger spray2 bottles

Best for: Bedrooms and living areas

• ✓Deltamethrin 0.03%, per the label
• ✓Odorless and non-staining, per the maker
• ✓Eliminates spiders, per buyers
• −Mixed trigger performance, per buyers
• −Value mostly negative, per buyers

Editor's Note

It suits rooms where any smell would bother you. Let it dry before the room is used.

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Specifications (3)

Item Form

Liquid,Spray

Unit Count

64 Fluid Ounces

Specification Met

EPA

Orange Guard Home Pest Control: Best for Kitchens

Orange Guard is a 32-ounce water-based spray with d-limonene at 5.8%, an extract of orange peel.

• It lists ants, roaches, fleas, palmetto bugs and silverfish, indoors and outdoors.
• The maker describes it as food-grade and biodegradable, with a mild orange scent.
• Buyers like the scent and find it safe around pets and children; effectiveness is mixed, with some reporting it works well on ants.

Choose it for ant trails and entry points in the kitchen, where you would rather not use a synthetic insecticide near food. Spray the insects and their entry points directly and reapply as needed, since it leaves little lasting residue.

Orange Guard Home Pest Control 32 oz

D-limoneneOrange peel

Best for: Kitchens and ant trails

• ✓Orange peel extract, per the maker
• ✓Pleasant scent, per buyers
• ✓Safe around pets and children, per buyers
• −Mixed effectiveness, per buyers
• −Little lasting residue

Editor's Note

It suits kitchen ant trails where you avoid synthetics near food. Reapply as needed.

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Specifications (3)

Item Form

Spray

Liquid Volume

32 fluid ounces

Unit Count

32 Fluid Ounces

Safer Home Multi-Insect Spray: Best Plant-Oil Contact Spray

Safer Home's 24-ounce spray uses cottonseed and clove oils and lists ants, flies, roaches, spiders, silverfish and fleas.

• The maker says it kills listed insects quickly on contact and dries without residue.
• It is labeled for kitchens, bathrooms, living rooms and basements.
• Buyers appreciate that it is safe around pets and children; many say it works only when sprayed directly on insects.

Choose it for spraying insects you see in living areas when you want a plant-based option. It is a contact spray, not a barrier, so pair it with sealing gaps and removing food sources, and keep it away from cats, which are sensitive to clove oil.

Safer Home Multi-Insect Spray 24 oz

Plant oilsAerosol

Best for: Plant-based spot spraying

• ✓Natural oils, per the maker
• ✓Dries without residue, per the maker
• ✓Safe around pets and children, per buyers
• −Works only on direct contact, per buyers
• −Keep away from cats (clove oil)

Editor's Note

It handles insects you see without synthetics. Pair it with sealing gaps.

Check Price

Specifications (2)

Item Volume

24 fluid ounces

Indoor Outdoor Usage

Indoor

How you apply them matters as much as which you choose.

How to Spray Indoors the Right Way

1. Identify the pest: and check that the label lists it and indoor use.
2. Clean and seal first: remove crumbs and standing water, and caulk gaps around pipes and baseboards.
3. Clear the area: move food, dishes, toys and pet bowls away.
4. Spray edges, not surfaces: a narrow band along floor edges, cabinet backs and door frames.
5. Ventilate and let it dry: keep people and pets out until surfaces are dry.
6. Do not clean the band: mopping baseboards removes the residue.
7. Recheck after a week or two: and treat again only as the label allows.

Professional exterminators use the same classes of insecticides, often pyrethroids, plus baits, dusts and insect growth regulators placed into wall voids and cracks. A roach or ant infestation that keeps returning usually needs baits rather than more spray. If you have been spraying the same spots for months without progress, switch tactics rather than products: find the entry point, seal it and bait the colony.

Common Questions About Indoor Pest Control Sprays

Which One Should You Buy?

Ortho Home Defense MAX is the indoor pest control spray to buy for most homes. It lists the common household invaders, has no odor, and keeps working for months along baseboards and entry points without being sprayed where people eat or sleep.

Choose TERRO's aerosol for cracks and the insect you see, Harris for bedrooms where odor matters, Orange Guard for kitchens and Safer Home for plant-based spot spraying. With any of them, seal gaps and remove food and water sources so the spray has less to do.

Before you buy, note where you see the pests most often, since those edges and entry points are where the spray goes.