What Does Tub Clean Mean on a Washer?

It is the only cycle on the machine whose job is the machine. The drum stays empty, the water fills higher than a wash cycle, the machine heats it, agitates for a long stretch, rinses more than once and drains. It runs on its own and is never added to a wash.

Why a normal wash can't clean the tub

A washer has two tubs. The perforated inner drum holds the clothes, and a sealed outer tub around it holds the water. A normal wash deliberately keeps the water level low, so the space between the two is never fully flooded. Detergent residue, fabric softener, body oils, lint and biofilm collect there load after load.

Tub Clean fills high enough to flood that space and flush it out. A hot empty wash is not a substitute, because it never reaches the same water level.

What happens during the cycle

The machine fills with the drum empty, then heats the water. Where there is no hot tap supply, an internal heater warms the cold water, and machines with steam inject steam. A long agitation follows, then repeated rinses and a drain. The water is very hot, so let it cool before you reach into the drum.

There is no single universal recipe. The maker's instructions for your machine are the rulebook, and following the wrong one can damage seals or the drum finish.

The one rule that overrides everything

Check the manual or the maker's support page before adding anything. The pattern by cycle name runs like this:

• Tub Clean (the name on the panel): typically an oxygen-based washer cleaner at the dose on the pack. Makers warn against chlorine-based or acidic cleaners, which can discolor or corrode the inside.
• Self Clean, Self Clean+ or Pure Cycle: typically nothing for routine runs. Bleach only if there is an existing mold or mildew smell, and then in the detergent compartment, not the bleach compartment.
• Basket Clean: typically 1 cup (about 250 ml) of liquid chlorine bleach, vinegar or a washer cleaner, poured into the basket.
• Clean Washer: typically one washer-cleaner tablet in the drum, or 1 cup (about 236 ml) of liquid chlorine bleach in the compartment. More bleach than that can damage the machine over time, and thickened or splashless bleach is not recommended.
• Drum Clean, where fitted: the maker's own drum cleaner.

Never add laundry detergent, fabric softener or any foaming cleaner, because foam can cause leaks. Never pour undiluted bleach straight onto the drum or the gasket.

Bleach, vinegar, tablets and oxygen cleaners

Bleach is the strongest option and the one most makers allow when a smell already exists. Dose it as the maker says and never exceed that.

Vinegar is a descaler, not a biofilm remover. It does not lift the greasy residue that causes smell, acid can attack rubber seals and hoses over time, and some makers advise against acidic cleaners outright. Check the manual before using it.

Washer-cleaner tablets are the simplest routine option where the maker allows them, and they go in the drum, not the dispenser. Oxygen-based cleaners are what several makers specify for the Tub Clean cycle, at the pack dose.

Never mix bleach with vinegar, ammonia or another cleaner, and do not run one straight after the other. The combination releases chlorine gas.

Most makers say about once a month, or every 30 wash cycles, whichever comes first. The range across machines runs from monthly to every 30 uses, and some count 20 washes on a top-load and 40 on a front-load.

A typical household runs roughly 300 loads a year, so monthly is a real interval rather than a suggestion to ignore. If the machine has gone a long stretch without a clean, run the cycle several times in a row, three consecutive runs on some makers' advice, then weekly until the smell clears.

Expect about an hour on a top-load and longer on a front-load, from about an hour to several hours depending on the machine. One common front-load design runs 60 to 90 minutes, some front-loads run up to about 4 hours, and one top-load design takes about 90 minutes.

Do not interrupt the cycle. An interrupted run may not count toward the reminder and can leave water sitting in the drum.

A flashing tCL, a CL code or a reminder light means the machine's cycle counter has reached its interval. It is not a sensor and cannot tell whether the drum is actually dirty. It appears after a set number of cycles, commonly 30, and some machines use 20 on top-loads and 40 on front-loads.

The code clears once a full clean cycle completes, or after a few normal cycles on some machines. A hot wash will not clear it.

Yes. On many machines you can run a normal wash instead when the reminder appears, so the code is a prompt, not a lockout. Skipping a single reminder costs nothing.

Skipping the maintenance over and over is how the residue and the smell build up in the first place. Run the cycle when the counter asks, and the drum stays ahead of the problem.

The cycle cleans the tub and the wash system. It does not reach three places where smell usually starts:

• The door gasket folds on a front-loader. Pull the lip back and wipe it, weekly.
• The detergent drawer and its housing. Remove the drawer and wash it in the sink, monthly.
• The drain pump filter. Front-loaders and combos only, behind a small panel at the bottom front, monthly. Top-loaders generally do not have one.

The symptom points to the job. A musty smell from an empty, closed drum points to the gasket first, and black speckling on the seal is the gasket. Sticky gel in the dispenser is the drawer. A smell low down or slow draining is the filter. Gray flakes on laundry or a tide line in the drum is what Tub Clean actually fixes.

Some habits keep the smell coming back: too much detergent, fabric softener, cold-water-only washing, clothes left wet in the drum, a drain hose pushed too far into the standpipe (it should sit only a few inches in, or it siphons), and a machine that is not level.

Foam during the cycle is not proof of residue. Soft water plus hot water plus agitation can foam on its own, and splashless bleach can foam too.

The cycle works the same way across machine types. What changes is where the button sits and how long the run takes.

• Front-load: the cycle that matters most, because the sealed outer tub and the gasket are where residue and mold collect. Run times are longer.
• Top-load: shorter, usually about an hour, and some designs dispense bleach from the bleach compartment automatically.
• Compact and portable washers: smaller drums and simpler controls. Where a clean cycle is fitted, the empty-drum rule still applies.
• Washer dryer combos: the washer half has the same maintenance cycle. Run it on the wash side, empty, and leave the door ajar afterward. Pedestal and add-on washers have their own reminder counter and their own clean cycle.

Run the hottest, longest cycle the machine has with the drum empty, plus a washer cleaner or about a cup of liquid chlorine bleach, then a rinse-and-spin. That is the fallback the makers themselves give for machines without a dedicated clean cycle.

Then do the gasket, the drawer and the filter by hand, whether or not the panel has a clean button.

Never run the cycle with laundry in the drum. It can damage the clothes and the machine. Never add detergent or softener, and never mix cleaning chemicals.

Keep straight bleach off the drum and the gasket. The water is very hot, so let it cool before reaching in. Leave the door and the dispenser open afterward to ventilate, and switch the machine off at the outlet before you clean the pump filter.