We earn a commission if you buy through links on this page, at no extra cost to you. Picks are based on each cleaner's stated chemistry, manufacturer instructions and Kamrul Islam's 14 years of enzyme and peroxide work in textile wet processing, not on our own product testing.
Quick answer
The best enzyme washing machine cleaner for most homes is an enzymatic tablet such as ACTIVE, run monthly on a warm or hot empty cycle. Enzymes digest body oils, protein soil and the sticky film that holds biofilm together. If your washer smells sour, use an oxygen cleaner like Affresh; if you have hard water, add a citric acid clean.
Our top picks at a glance
ACTIVE Enzymatic Washing Machine Cleaner Tablets, 24 ct
A true enzymatic tablet that is septic-safe and works in top-load, front-load and HE washers.
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Affresh Washing Machine Cleaner Tablets, 6 Count
Sodium percarbonate plus washing soda, from the cleaner brand that Whirlpool recommends for its washers.
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Lemi Shine Washing Machine Cleaner with Wipes, 4 ct
Citric acid dissolves the limescale that enzymes and oxygen bleach leave behind.
Buy on AmazonLaundry still smells after a clean? Read why your laundry smells and how to fix it.
Enzyme washing machine cleaners compared
| Cleaner | Main chemistry | Best for | Washer types | |
|---|---|---|---|---|
| Enzymes | Body soil, pet residue, monthly care | Top, front, HE | Buy on Amazon |
 | Enzymes + oxygen blend | Pet hair and fur build-up | Top, front, HE | Buy on Amazon |
| Oxygen bleach (percarbonate) | Sour smells, residue film | Top, front, HE | Buy on Amazon |
 | Descaler / deodoriser | Neglected, heavily scaled tubs | Top, front, HE | Buy on Amazon |
No products found. Tide Washing Machine Cleaner with Oxi | Oxygen bleach (Oxi) | Low-cost monthly routine | Top, front, HE | No products found. |
| Citric acid | Hard-water scale, gasket wipe-down | Top, front, HE | Buy on Amazon |
Chemistry is taken from each brand's own listing or ingredient page. Formulas can change, so check the pack.
How an enzyme cleaner for washing machines works
A smelly washer is rarely dirty from mud. The grime is mostly body soil (skin oils, sweat proteins), detergent and softener build-up, and a biofilm of bacteria and mould living in that film. Cold washes make it worse, because fatty soils never melt and rinse away.
Enzymes are proteins that each cut one type of molecule. Protease breaks down protein soil, lipase breaks down oils and fats, and amylase breaks down starch. Biofilm bacteria glue themselves to the drum with a slime of sugars and proteins, and enzymes break that glue so the film rinses away. Enzymes don't bleach or kill microbes, so good formulas add surfactants or a mild oxygen booster.
| Cleaner type | What it removes best | What it misses | Best water temperature |
|---|---|---|---|
| Enzyme | Body oils, protein soil, softener-bound grime, biofilm slime | Limescale, heavy mould staining | Warm, about 40 to 60°C |
| Oxygen bleach (sodium percarbonate) | Odour, mildew staining, organic film | Limescale | Hot, 60°C and up |
| Citric acid | Limescale, mineral and metal-soap deposits | Fatty and protein soil | Warm to hot |
| Chlorine bleach | Kills mould and bacteria | Grease film; can damage seals over time | Cold to warm, never mixed with acids |
Typical ranges for each chemistry. Follow the pack and your washer manual.
Expert tip from Kamrul Islam
In the dye house we run enzyme washes on fabric every day, and the rule is always the same: get the temperature and pH right or the enzyme does nothing. Most detergent enzymes work best warm and mildly alkaline, and they start to die above about 60 to 65°C. That is why an enzyme cleaner should go on a warm cycle, and why a boiling-hot 90°C tub clean wastes the enzymes.
Enzyme vs oxygen bleach vs citric acid washer cleaners
Oxygen cleaners such as Affresh and Tide use sodium percarbonate, which releases hydrogen peroxide in water to oxidise odour and mildew staining; it works better the hotter the water. Citric acid cleaners such as Lemi Shine dissolve limescale and the grey 'scud' that hard-water minerals form with soap. Enzyme cleaners are the gentlest on rubber seals and work at the lowest temperature.
The best routine is to alternate: enzyme cleaner most months, oxygen cleaner when the smell turns sour, and citric acid two to four times a year in hard-water areas. Softener users gain most from enzymes, because softener deposits trap body oils. A cleaner fabric softener also means less build-up.
Good to know
Never mix chlorine bleach with citric acid, vinegar or any acidic cleaner, as it releases chlorine gas. Run one cleaner per cycle and let it rinse out fully.
The 6 best enzyme and washing machine cleaners reviewed
ACTIVE Enzymatic Washing Machine Cleaner Tablets, 24 ct
Enzymatic tablet · 24 tablets · septic-safe
ACTIVE is one of the few washer cleaners built around enzymes rather than bleach. It is sold for pet owners, but the same enzymes go after human body soil, detergent residue and the slime behind musty smells.
Pros
- True enzymatic formula
- Septic-safe, according to the brand
- Large 24-tablet pack for regular use
Cons
- Won't remove heavy limescale
- Needs a warm cycle, not cold
Skip it if skip it if your main problem is hard-water scale; pair it with a citric acid clean instead.
Expert tip from Kamrul Islam
Use a warm or hot normal cycle, not the 90°C sanitise setting. Enzymes are proteins, and very hot water switches them off early.
Uproot Clean Washing Machine Cleaner Tablets Ultra, 24 Pack
Enzyme and oxygen blend · 24 tablets · pet-focused
Uproot Clean is made for homes where fur builds up in the drum and filter. The brand's tablets combine enzymes with oxygen-based cleaning agents, so you get oily-residue digestion plus deodorising.
Pros
- Targets fur, dander and pet odour
- Enzyme plus oxygen in one tablet
- Works in all washer types
Cons
- Pet focus is more than many homes need
- Formula details vary by version
Skip it if skip it if you have no pets; a plain enzyme or oxygen cleaner does the same job for most homes.
Expert tip from Kamrul Islam
Clean the drain pump filter every few weeks. Tablets loosen the oily film that holds fur, but they can't dissolve hair.
Affresh Washing Machine Cleaner Tablets, 6 Count
Sodium percarbonate · washing soda · 6 tablets
Affresh lists sodium percarbonate and sodium carbonate as its main cleaners. The percarbonate releases peroxide to break down odour residue, the washing soda cuts grease, and the brand recommends a monthly clean.
Pros
- Clear, published ingredient list
- Strong on sour and musty smells
- Made by a washer-cleaner brand from a major appliance maker
Cons
- Contains fragrance
- No enzymes for protein soil
Skip it if skip it if you want fragrance-free; choose an unscented enzyme cleaner instead.
Expert tip from Kamrul Islam
Oxygen bleach needs heat; in industrial bleaching, peroxide runs close to the boil. Use the hottest cycle your washer allows.
Renuv Heavy Duty Washing Machine Cleaner & Descaler Tablets
XL tablets · descaler and deodoriser · monthly
Renuv is a popular choice for washers that have gone months without a clean, sold as a heavy-duty cleaner, descaler and deodoriser in XL tablets. A very dirty tub may need two cleans in a row.
Pros
- Descales as well as deodorises
- XL tablet for large drums
- Front-load, top-load and HE friendly
Cons
- Full ingredient list not shown on the listing
- Not an enzyme cleaner
Skip it if skip it if you specifically want an enzyme-based cleaner for regular monthly care.
Expert tip from Kamrul Islam
For a neglected washer, strip the old film with a heavy-duty clean first, then switch to a monthly enzyme tablet.
Tide Washing Machine Cleaner with Oxi
Oxi powder · pre-measured pouches · monthly
Tide Washing Machine Cleaner uses an oxygen bleach powder in single-dose pouches. It is easy to find, low in cost per clean and a solid monthly maintenance product rather than a deep descaler.
Pros
- Low cost per clean
- Big multi-month supply
- Simple pour-in pouches
Cons
- Powder can clump in damp rooms
- No enzymes or acid descaler
Skip it if skip it if your washer has hard-water scale; oxygen bleach won't dissolve it.
Expert tip from Kamrul Islam
Store powder cleaners away from the washer. Percarbonate slowly loses oxygen in humid air.
Lemi Shine Washing Machine Cleaner with Wipes, 4 ct
Citric acid powder · machine wipes · 4 cleans
Lemi Shine uses citric acid to dissolve limescale and mineral film, then gives you a wipe for the door seal. If your drawer has white crust or towels feel stiff, scale is part of the problem.
Pros
- Dissolves limescale and mineral deposits
- Includes wipes for the gasket
- No chlorine bleach
Cons
- Weak against oily body soil
- Only 4 cleans per pack
Skip it if skip it if you have soft water; an enzyme or oxygen cleaner will help more.
Expert tip from Kamrul Islam
We descale dye machines with acid for the same reason: minerals bind dirt to steel. Run citric acid on its own cycle, never with bleach.
How to clean a washing machine with an enzyme cleaner
- Empty the drum. Remove clothes, coins and lint.
- Clean the seal and drawer. The only tools for cleaning a washing machine you need are a microfibre cloth and an old toothbrush. Wipe hair and slime from the door gasket and scrub the detergent drawer.
- Add the cleaner to the drum. Put the tablet or powder in the empty drum, not the dispenser, unless the pack says otherwise.
- Pick the right cycle. Warm or hot normal cycle for enzyme tablets; 'Tub Clean' or the hottest cycle for oxygen cleaners.
- Dry and air it. Wipe the drum and gasket, then leave the door and drawer open for a few hours. On front-loaders, clean the pump filter every month or two.
Front-load vs top-load vs HE washers: what changes
Front-load washers smell first, because the rubber door gasket holds water and low water levels leave residue behind. Clean monthly and wipe the gasket weekly. Top-load washers hide grime under the rim and agitator, so let the tub fill with cleaner and pause it for an hour before finishing the cycle. HE machines use little water, so overdosing detergent is the main cause of build-up. Measure HE detergent to the line.
Buyer's guide: choosing a washing machine enzyme cleaner
Match the chemistry to the problem. Musty or 'wet dog' smell and grey film point to body soil and biofilm, so pick enzymes. A sour smell or black spots on the seal point to mildew, so pick oxygen bleach. White crust, stiff towels and scale point to hard water, so pick citric acid.
Check that it really contains enzymes. Many tablets say 'enzyme' in the title but list only percarbonate and soda. Look for protease, lipase or amylase on the ingredient list or the brand's website.
Think about your wash habits. Cold washes, liquid softener, gym kit and pets all build fatty residue faster, so clean every two weeks instead of monthly. For soft furnishings, see our fabric sprays for pet odours.
Frequently asked questions
What is the best enzyme washing machine cleaner?
ACTIVE enzymatic tablets are our top pick because they use real enzymes, are septic-safe and suit all washer types. Uproot Clean Ultra is the better choice for homes with heavy pet hair.
Do enzyme cleaners for washing machines actually work?
Yes, for the right problem. Enzymes break down body oils, protein soil and the slime that holds biofilm to the drum, which causes most musty smells. They do not remove limescale, so pair them with a citric acid clean in hard-water areas.
How often should you clean a washing machine?
Once a month for most homes. Clean every two weeks if you wash mostly cold, use fabric softener or have pets, and run an extra clean if the washer starts to smell.
Is Renuv washing machine cleaner any good?
Renuv is a well-liked heavy-duty descaler and deodoriser, useful for neglected washers. It is not marketed as an enzyme cleaner, so it pairs well with a monthly enzyme tablet for ongoing care.
Can I use an enzyme cleaner and bleach together?
No, run them on separate cycles. Chlorine bleach destroys enzymes, and strong peroxide can weaken them too.
What temperature should I use for an enzyme washer cleaner?
Use a warm to hot normal cycle, roughly 40 to 60°C. Very hot sanitise cycles above about 65°C can deactivate enzymes before they finish working.
Is cleaning a washing machine with vinegar as good as a cleaner tablet?
No. Vinegar is a weak acid that helps with light scale but does little against oily body soil or biofilm, and repeated use can dry out some rubber seals.
Do HE washers need a special washing machine cleaner?
No, but choose one labelled HE-safe and avoid high-foaming products. All six picks here are sold as HE-compatible.
Our verdict
The verdict
For most homes, a monthly enzyme tablet like ACTIVE on a warm cycle keeps body soil and biofilm from building up. Switch to an oxygen clean such as Affresh when the smell turns sour, and use Lemi Shine a few times a year in hard-water areas.
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