Most people think of their washing machine as a self-cleaning appliance — it runs hot water and detergent through itself every day, so surely the inside stays clean. In practice, the opposite is true. Over time, washing machines accumulate detergent residue, mineral deposits, body soil, fabric softener film, and bacterial colonies that embed into the drum, gasket, door boot, and internal hoses. Running a dedicated cleaning cycle is the most direct way to flush all of this out and restore the machine to a hygienic baseline.
What a Cleaning Cycle Does
A cleaning cycle differs from a regular wash in three important ways. It runs hotter — typically 60°C to 90°C — to kill bacteria and break down organic residue. It uses no laundry load, which means the drum agitates with cleaning solution rather than fabric, reaching every surface. And it runs for a longer or more intensive cycle duration, giving the cleaning agent time to penetrate biofilm and scale deposits.
Modern front-loaders and top-loaders often include a dedicated Drum Clean, Tub Clean, or Self Clean setting. If your machine has this programme, use it. If not, select the hottest and longest available cycle — a 90°C cotton cycle on a front-loader is effective.
Cleaning Agents: Which to Use
Proprietary washing machine cleaner tablets or sachets (such as Dettol Washing Machine Cleaner or Affresh) are the most convenient option. Drop one in the drum — not the dispenser — and run the designated cycle.
White vinegar is a widely used home remedy. Pour 500 ml directly into the drum. It dissolves mineral scale and deodorises effectively but is less potent against established bacterial colonies.
Bleach (sodium hypochlorite) is the strongest option for mould and bacteria. Use 120 ml diluted in water, added to the detergent dispenser. Do not combine bleach with vinegar — the reaction produces chlorine gas.
Citric acid powder (2–3 tablespoons dissolved in water) is an effective and safer descaler, particularly useful in hard water areas where limescale is the primary concern.
Step-by-Step Procedure
Step 1 — Empty the machine. Confirm the drum is completely empty before starting. Running a cleaning cycle with laundry inside wastes the cycle and may damage fabrics at high temperatures.
Step 2 — Add your cleaning agent. Place a cleaning tablet in the drum, or add your chosen liquid agent to the appropriate compartment — vinegar and bleach go into the drum or main wash compartment, not the softener tray.
Step 3 — Select the correct programme. Choose the Drum Clean setting if available, otherwise select the hottest long cycle. Do not add any laundry or detergent.
Step 4 — Run the full cycle. Do not pause or interrupt the cycle. Allow the machine to complete the full programme including all rinse stages.
Step 5 — Wipe down after completion. Once the cycle finishes, open the door and wipe the drum interior, the door glass, and the door gasket folds with a clean dry cloth. Leave the door open to air out for at least an hour.
Frequency Guide
| Machine Usage | Cleaning Cycle Frequency |
|---|---|
| Daily (family household) | Once a month |
| Moderate (2–3 loads per week) | Every 6 weeks |
| Light (occasional) | Every 2–3 months |
Machines in areas with hard water or high humidity should clean more frequently, as limescale and mould establish faster under those conditions.
Signs Your Machine Needs a Cleaning Cycle Immediately
- Laundry comes out smelling musty despite being freshly washed
- Visible dark staining or slime inside the drum or gasket
- A sour or chemical odour when the door is opened
- White chalky residue on dark fabrics after washing
Running a cleaning cycle monthly is a straightforward discipline that directly protects the quality of your laundry and extends the internal lifespan of every component the water touches.