By Jasman, Co-founder of PureZest | Updated September 2026 | 8-minute read

Key Takeaways

• You can safely clean small areas of bathroom mould yourself with warm water and dish soap. Health Canada says there's no need to use bleach.
• A small area means up to three patches, each smaller than 1 square metre (about 10 square feet). Anything larger, or mould that keeps coming back, may need a professional.
• Cleaning is only half the job. Mould returns unless you fix the moisture that caused it.
• Weekly cleaning with an enzyme-based bathroom cleaner breaks down the soap scum and body oils that mould and mildew feed on, so surfaces stay cleaner for longer.
• Mould that has grown into silicone caulk usually can't be cleaned out and should be replaced.

Why Is There Mould in My Bathroom?

Bathroom mould (also spelled mold) grows wherever moisture stays put. Hot showers fill the room with steam, water sits in grout lines and corners, and soap scum and body oils give mould something to feed on.

In Canada, the problem usually gets worse in fall and winter. Windows stay closed, homes are sealed tight against the cold, and in wet regions like BC's Lower Mainland, damp weather can last for months. Without good ventilation, that shower steam has nowhere to go.

The most common places to find it are shower grout, silicone caulk around the tub, the ceiling above the shower, window sills, behind the toilet, and under bath mats.

Mould vs. Mildew: What's the Difference?

Mildew is a type of mould that stays on the surface and usually looks grey, white, or powdery. Other moulds can look black or green and fuzzy, and they may grow into porous materials like caulk and drywall. For small patches on bathroom surfaces, you clean both the same way.

What About Pink Mould in the Shower?

That pink or orange slimy film around drains, grout, and shower curtains is usually not mould at all. It's typically a type of airborne bacteria that thrives in damp spots and feeds on soap scum and body oils. The fix is the same: clean away the soap scum it lives on, dry the surface, and improve ventilation. An enzyme-based bathroom cleaner is especially useful here, because the enzymes break down the residue the pink film feeds on instead of just wiping over it.

Step 1: Check How Much Mould You Have

Before you start, figure out whether this is a DIY job. According to the Canadian Centre for Occupational Health and Safety, a small area is one to three patches, each smaller than 1 square metre. Most people can safely clean small areas themselves.

Call a professional if:

• The mould covers a large area
• It keeps coming back after you clean it
• You can smell a musty odour but can't see where it's coming from (it may be inside a wall)
• It's the result of a leak or flood

If you rent, tell your landlord about mould problems right away.

Step 2: Protect Yourself

• Wear rubber gloves, eye protection, and a well-fitted dust mask (an N95 is a good choice).
• Open a window and turn on the exhaust fan.
• Keep children, pets, and anyone with asthma or allergies out of the room while you clean.

Step 3: Scrub the Mould Away

For small patches, Health Canada recommends water and dish detergent, with no bleach needed.

1. Mix a few drops of dish soap into a bucket of warm water. If anyone in your home is sensitive to scents, choose an unscented or low-fragrance soap.
2. Dip a stiff brush or old toothbrush into the solution and scrub the mould off tiles, grout, and hard surfaces.
3. For painted ceilings or drywall, use a damp cloth instead of a wet one so you don't soak the drywall.
4. Work in small sections and rinse your cloth often so you're not spreading mould around.

Tip for tiles, tubs, and grout: A foaming enzyme cleaner like PureZest Bathroom Cleaner clings to vertical tiles and glass, then breaks down the soap scum and grime trapped in grout lines. Spray, wait 1–2 minutes, then scrub. It contains no bleach, so it won't discolour coloured grout.

Step 4: Rinse and Dry Completely

Wipe the area with clean water, then dry it thoroughly with a microfiber cloth. This step matters more than most people think. A damp surface is exactly what mould needs to grow back.

Step 5: Replace What You Can't Clean

• Silicone caulk: Once mould grows into caulk, it's usually stuck there. Cut out the old caulk, clean and dry the area, and apply fresh mould-resistant bathroom caulk.
• Grout: Surface stains usually scrub out. If grout is cracked or crumbling, it lets water behind your tiles and should be repaired.
• Drywall: If drywall is soft, stained through, or heavily covered, it likely needs to be replaced.

Step 6: Fix the Moisture Problem

If you skip this step, the mould will come back. Look for leaking taps, a dripping shower head, damaged caulk, poor ventilation, or condensation on cold windows and walls.

Why You Don't Need Bleach for Bathroom Mould

Many people reach for bleach first, but Health Canada says it isn't necessary for cleaning mould. Here's why a gentler approach makes sense:

• Bleach fumes in a small bathroom can irritate your eyes, nose, and lungs.
• Bleach can make mould look gone by whitening the stain, without removing the residue underneath or fixing the moisture that caused it.
• Bleach can discolour coloured grout and some surfaces.
• Mixing is dangerous. Never mix bleach with vinegar, ammonia, or other cleaners. The combination releases toxic gas.

Scrubbing physically removes the mould. Drying the area, controlling humidity, and cleaning away the residue mould feeds on keep it from coming back.

Why PureZest Bathroom Cleaner Works So Well in Mould-Prone Bathrooms

Most bathroom sprays clean what you can see. PureZest Bathroom Cleaner is designed to go after what mould and mildew actually live on.

1. Enzyme technology that goes deeper

Our bio-enzymes break down the soap scum, body oils, and organic residue that build up on tiles, tubs, and grout. That residue is the food source for mould, mildew, and pink film. Remove the food source, and you make it much harder for them to come back.

2. Double action for Canadian hard water

Citric acid, derived from citrus fruits, dissolves limescale and hard water deposits, while the enzymes take care of soap scum. Together they tackle both types of buildup where grime gets trapped.

3. A foam that stays put

Coconut-derived coco betaine creates a thick foam that clings to vertical tiles and shower doors, giving the enzymes time to work before you wipe. That's what gives you a true deep clean, not just a quick surface wipe.

4. Stays cleaner for longer

Because the enzymes break down residue instead of smearing it around, there's less left behind for dirt and mildew to cling to. Our customers regularly tell us their tubs and tiles stay clean longer between cleans than with other products they've used.

5. No bleach, no ammonia, no harsh fumes

Clean a small, closed bathroom without the chlorine smell. Instead, you get a fresh peppermint and lemon scent, and your coloured grout stays its original colour.

6. Kind to your pipes and septic system

As you rinse, the enzyme-rich water keeps working on the organic buildup in your drain. It's also safe for septic systems.

How to get the best results

1. Spray the tub, tiles, grout, or sink generously.
2. Wait 1–2 minutes. This is the key step. It gives the enzymes time to break down soap scum.
3. Scrub with a brush or sponge, paying extra attention to grout lines.
4. Rinse and dry with a microfiber cloth.

Shop PureZest Bathroom Cleaner, or save with the 1.9L refill pack.

Please note: PureZest Bathroom Cleaner is an everyday cleaner, not a registered mould killer or disinfectant. It works by cleaning away the residue mould feeds on. For large or recurring mould, contact a professional.

How to Stop Bathroom Mould From Coming Back

1. Run the exhaust fan during every shower and for at least 30 minutes afterward. If you don't have one, consider getting one installed.
2. Squeegee or wipe down shower walls and glass after each use.
3. Keep humidity low. A simple hygrometer shows your indoor humidity. If it stays high, a dehumidifier helps, especially in fall and winter.
4. Clean weekly with an enzyme bathroom cleaner so soap scum and body oils don't build up and give mould something to feed on.
5. Wash and fully dry bath mats, towels, and shower curtains regularly. Hang towels spread out, not bunched up.
6. Fix leaks and damaged caulk as soon as you spot them.
7. Leave the door open after showering to let damp air escape.

A Simple Weekly Routine to Keep Mould Away

Everything You Need for a Mould-Free Bathroom

• PureZest Bathroom Cleaner: enzyme-powered deep clean for tubs, tiles, and grout
• PureZest Enzyme Dish Soap: for the warm-water-and-soap scrub on walls and ceilings
• PureZest Premium Microfiber Cloths: for drying surfaces completely
• 10-Minute Bathroom Reset Kit: the complete weekly bathroom routine in one bundle

New to natural cleaning? Read our Canadian Guide to Natural Cleaning Products.

Frequently Asked Questions

Should I use bleach to clean mould in my bathroom?

You don't need to. Health Canada recommends cleaning small areas of mould with water and dish detergent. Bleach adds harsh fumes in a small space and doesn't fix the moisture that causes mould.

What is the best natural cleaner for a mouldy bathroom?

For scrubbing off small patches, warm water and dish soap work well. For weekly cleaning, an enzyme-based bathroom cleaner like PureZest Bathroom Cleaner is a strong choice, because it breaks down the soap scum and body oils that mould and mildew feed on.

What is the pink stuff in my shower?

The pink or orange film around drains and grout is usually bacteria, not mould. It feeds on soap scum, so regular cleaning with an enzyme bathroom cleaner, drying surfaces, and good ventilation help keep it away.

Does vinegar kill bathroom mould?

Vinegar can help with some mould on hard surfaces, but it isn't necessary, and it can damage natural stone like marble and granite. Scrubbing with soap and water, then drying the area, works for most small patches.

Is black mould in my shower dangerous?

You can't tell what type of mould it is by colour alone. Most dark spots in showers are common surface mould, but any indoor mould can affect health, especially for children, seniors, and people with asthma or allergies. Clean small patches promptly and fix the moisture source.

Why does mould keep coming back in my bathroom?

Almost always because of moisture and leftover residue. Poor ventilation, leaks, damaged caulk, and soap scum buildup keep giving mould what it needs. Fixing moisture and cleaning weekly are the long-term solution.

Can I clean mould out of silicone caulk?

Usually not. Mould tends to grow into the caulk itself, so surface cleaning won't remove it. The best fix is to cut out the old caulk and replace it.

When should I call a professional for mould?

Call a professional if the mould covers a large area, keeps coming back after cleaning, is caused by a leak or flood, or if you smell mould but can't find it.

The Bottom Line

Removing bathroom mould doesn't require harsh chemicals. For small patches, protect yourself, scrub, dry the area completely, and fix the moisture problem. Then keep it away with a fan, a squeegee, and a weekly enzyme clean that removes the residue mould feeds on.

Ready for a deeper, longer-lasting clean? Try PureZest Bathroom Cleaner or get the full 10-Minute Bathroom Reset Kit.

About the author: Jasman is the co-founder of PureZest, a BC-based natural cleaning brand, and previously ran a cleaning services business.

This article is for general information. If you have health concerns related to mould, speak with a healthcare provider.