Methylisothiazolinone

A potent preservative and known skin sensitizer.

Also known as: mi, mit, cmit/mit, methylchloroisothiazolinone

CAS #: 2682-20-4

Puppy Safety

4.0

Adult Dog Safety

5.0

Paw Safety

4.0

Respiratory Safety

6.0

Licking Risk

5.0

Environmental

5.0

Ingredient Transparency

—

Cleaning Performance

—

What this means for your dog

Plain-language read of the sub-scores above.

Around puppiesExtra care recommended around puppies. Consider a gentler alternative or keep puppies away until surfaces are fully dry.
Around pawsHigher potential for paw irritation. Rinse thoroughly and consider a paw wipe after contact.
If lickedDo not let dogs lick treated surfaces. Rinse well and store securely; call your vet or poison line if ingested.
In the airVentilate the room during and after use — open a window or run a fan.

Why brands use it

preservative

Found in these product types

Fabric Softeners

9 products contain Methylisothiazolinone

7.9

Air Fresheners

3 products contain Methylisothiazolinone

6.2

Floor Cleaners

3 products contain Methylisothiazolinone

5.8

Laundry Detergents

2 products contain Methylisothiazolinone

6.8

Dish Soaps

2 products contain Methylisothiazolinone

5.9

Dog Shampoos

2 products contain Methylisothiazolinone

6.4

Glass Cleaners

1 product contain Methylisothiazolinone

7.6

Carpet Cleaners

1 product contain Methylisothiazolinone

5.7

Bathroom Cleaners

1 product contain Methylisothiazolinone

5.9

Hand Soaps

1 product contain Methylisothiazolinone

8.0

Kitchen Cleaners

1 product contain Methylisothiazolinone

5.9

Dryer Sheets

1 product contain Methylisothiazolinone

7.0

Products containing Methylisothiazolinone

Woolite · Laundry Detergents

Woolite Delicates Liquid

6.8

Better Life · Glass Cleaners

Better Life See Clearly Glass Cleaner

7.6

Fleecy · Fabric Softeners

Fresh Air Liquid Fabric Softener

7.1

Resolve · Carpet Cleaners

Resolve Pet Expert High Traffic Foam

5.7

Better Life · Dish Soaps

Better Life Dish Soap

5.9

Fleecy · Fabric Softeners

Calm Liquid Fabric Softener (Vanilla & Honey Lotus)

7.1

Glade · Air Fresheners

Glade Aerosol Air Freshener

6.2

Fleecy · Fabric Softeners

Sensations Brazilian Paradise Liquid Fabric Softener

7.1

Fleecy · Fabric Softeners

Shed Shield Pet Hair & Odor Fabric Conditioner

7.1

Method · Floor Cleaners

Method Squirt + Mop Almond Floor Cleaner

5.8

Fleecy · Fabric Softeners

Plus Fresh Air Liquid Fabric Softener

7.1

Mrs. Meyer's · Air Fresheners

Mrs. Meyer's Room Freshener Lavender

5.5

Purex · Laundry Detergents

Purex Free & Clear Liquid

6.3

Ajax · Dish Soaps

Ajax Ultra Triple Action Dish Liquid Orange

5.5

Mrs. Meyer's · Bathroom Cleaners

Mrs. Meyer's Tub & Tile Cleaner

5.9

Method · Floor Cleaners

Method Squirt + Mop Hard Floor Cleaner

5.5

Fleecy · Fabric Softeners

Odor Shield Liquid Fabric Softener

7.9

Fleecy · Fabric Softeners

Sensations Hawaiian Escape Liquid Fabric Softener

7.1

Nellie's · Hand Soaps

One Soap

8.0

Fleecy · Fabric Softeners

Pure Balance Rosewater Liquid Fabric Softener

7.1

Better Life · Kitchen Cleaners

Better Life What-Ever! All-Purpose Cleaner

5.9

John Paul Pet · Dog Shampoos

John Paul Pet Tea Tree Shampoo

6.4

John Paul Pet · Dog Shampoos

John Paul Pet Oatmeal Shampoo

5.7

Fleecy · Fabric Softeners

Sensations Lavender Liquid Fabric Softener

7.1

Better Life · Floor Cleaners

Better Life Naturally Dirt-Destroying Floor Cleaner

5.2

Fleecy · Dryer Sheets

Sensations Lavender Dryer Sheets

7.0

Glade · Air Fresheners

Glade Aerosol Spray Clean Linen

6.0

Learn more

Tick Check Season in Ontario: A Calm, Practical Guide for Dog Families

Ontario's tick season now stretches from early spring through late fall. Here's how to build a calm, consistent tick-check habit for your dog — without the panic.

Best Family Dogs: Finding the Perfect Match for Your Family

Choosing the best family dog isn't about finding the most popular breed—it's about finding the right match for your family's lifestyle. In this guide, we explore some of the best family-friendly dog breeds in Canada, what makes them great companions, the responsibilities of dog ownership, and how to choose a puppy from a responsible breeder. Whether you're welcoming your first dog or adding another four-legged family member, this article will help you make an informed decision that benefits both your family and your future companion.

Dog-Friendly Yukon: Northern Adventures, Midnight Sun & Bucket-List Escapes With Your Dog

Discovering Dog-Friendly New Brunswick: Coastal Adventures, Charming Towns & Unforgettable Escapes

Best Family Dogs for Canadian Families: Finding the Right Match for Your Family

There is no such thing as the "perfect family dog." There is only the perfect dog for your family.

Best Apartment Dogs for Canadian Families: Finding the Perfect Dog for Condo and City Living

Sources

SCCS EU

CleanWise provides educational information to help dog owners make informed household choices. Scores are based upon ingredient transparency, intended use and currently available information. Individual dogs may have different sensitivities. Always follow manufacturer instructions.