The quick answer
When clothes come out of the wash still dirty, grey or marked, the machine usually isn’t broken — it’s being asked to do an impossible job. The most common reasons are an overloaded drum, too little detergent, the wrong cycle for the soil level, or a dirty machine that is redepositing grime onto your laundry. Fixing how you wash usually solves it.
Common causes
- Overloading: a packed drum can’t tumble clothes through the water and detergent, so nothing gets properly cleaned.
- Too little detergent: under-dosing — or using a quick cycle with little water — leaves dirt behind.
- Wrong cycle: a short or cold eco wash isn’t enough for heavily soiled items.
- Dirty machine: a drum full of mould and grease redeposits black bits and grey film.
- Cold water and undissolved detergent: powder doesn’t activate in very cold water.
- Stains that were never pre-treated: dried-in or greasy stains need treating before the wash.
Step-by-step fix
- Wash smaller loads. Leave a hand’s width of space at the top of the drum so clothes can move.
- Use the correct detergent dose for your load size and soil level — and a little more for heavily soiled washing.
- Choose the right cycle. Use a longer, warmer programme (40–60°C) for dirty items rather than a quick cold wash.
- Pre-treat stains. Dab stain remover or detergent onto marks before loading.
- Clean the machine. Run a hot maintenance wash if you see grey film or black flecks on clothes.
- Sort the laundry so heavily soiled items aren’t mixed with lightly worn ones.
How to prevent it
- Don’t overload, and don’t always default to the quickest cycle.
- Keep the machine clean with a monthly maintenance wash.
- Match temperature to fabric and soil level.
- Pre-treat tough stains every time.
If clothes come out with grey film or specks rather than just unwashed dirt, the machine itself needs attention — see how to clean the drum and filter and how to run a maintenance wash. Choosing the right machine size also helps — see our capacity guide.
When to call a technician
If you’ve corrected loading, dosing and cycle choice and clothes still aren’t clean, the machine may not be filling with enough water, heating the water, or agitating properly. A faulty inlet valve, heater or motor can all reduce wash performance and need an engineer to diagnose.