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A dishwasher that comes out looking clean — but leaves plates dirty — is one of the most frustrating appliance problems.

The cycle finishes.
The light goes off.
But the dishes still look like they’ve barely been touched.

It’s a very common issue, and in many cases, it’s fixable without replacing the appliance.

Here’s what’s usually going wrong when a dishwasher isn’t cleaning properly — and when it’s time to get it checked by an engineer.

Common Signs Your Dishwasher Isn’t Cleaning Properly

Customers often contact us after noticing things like:

  • Food residue left on plates and glasses

  • Greasy film on dishes

  • Glasses coming out cloudy

  • Tablet not dissolving properly

  • Water inside, but no real cleaning action

If your dishwasher is switching on and completing a cycle, but the results are poor, the issue is usually mechanical rather than electrical.

The Most Common Causes We See

Blocked or Faulty Spray Arms

Spray arms are responsible for distributing water around the dishwasher.
If they’re blocked with debris or not spinning freely, water can’t reach the dishes properly.

This is one of the most common causes of poor cleaning.

Cold Water or Heating Issues

If the dishwasher isn’t heating the water correctly, grease and food residue won’t break down.

Heating-related faults are common and often linked to:

  • Faulty heating elements

  • Temperature sensors

  • Control issues

A dishwasher can sound like it’s working perfectly, while still washing in cold water.

Drainage or Pump Problems

If dirty water isn’t draining away properly, it can be recirculated during the wash.

This can be caused by:

  • Partial blockages

  • Worn or faulty pumps

  • Internal build-up over time

These issues often worsen gradually, rather than failing suddenly.

Detergent and Tablet Issues

If detergent isn’t being released or dissolved correctly, cleaning performance drops quickly.

This can be linked to:

  • Faulty dispensers

  • Water flow issues

  • Mechanical faults preventing proper circulation

When It’s Worth Calling an Engineer

If you’ve:

  • Cleaned filters and spray arms

  • Tried different detergents

  • Run hot wash cycles

  • Checked loading isn’t obstructing movement

…and the problem keeps returning, it’s usually time for a professional inspection.

Continuing to use a dishwasher that isn’t cleaning properly can lead to:

  • Further internal blockages

  • Pump strain

  • More costly repairs later on

Can a Dishwasher Like This Be Repaired?

In most cases, yes.

Many dishwasher cleaning faults come down to:

  • Replaceable components

  • Cleaning or clearing internal parts

  • Straightforward repairs once the cause is identified

An experienced engineer can usually tell quickly whether a repair is worthwhile.

Local Dishwasher Repairs You Can Rely On

At Domestic Repairs Ltd, our engineers regularly attend dishwasher faults across London and surrounding areas.

We focus on:

  • Clear diagnosis

  • Honest advice

  • Practical repairs where possible

If your dishwasher isn’t cleaning properly, we’ll help you understand what’s going on — and whether repair is the right option.

You can find more information about our service here:
👉 https://www.domesticrepairs.ltd.uk/dishwasher-repairs/

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