Why Does My Dishwasher Smell — And How Do You Stop It Coming Back?

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That sour smell coming from your dishwasher isn’t about how well it cleaned your last load of dishes. The real issue is what’s happening between washes—food debris trapped in hidden spots where it rots, creating odours that get pumped back onto your clean plates. You could run cleaning cycles every week, but if you’re not reaching these specific areas, the smell will keep returning.

This pattern explains why basic maintenance washes often fail. The fix lies in targeting the mechanical traps rather than just the visible interior.

Starting with the filter

A clogged filter is the most common cause of dishwasher odours, and manufacturers such as Beko and Bosch point owners to the filter first in their support pages. Your dishwasher’s filter system typically has two layers: a coarse mesh for larger particles and a finer mesh underneath. Food scraps caught here sit in stagnant water at the machine’s base, decaying between cycles.

Cleaning this component is straightforward—remove it, rinse under hot water, and gently scrub the mesh. If you haven’t done this recently, prepare for some unpleasant residue. Our step-by-step filter cleaning guide walks you through the process.

Beyond the filter: hidden trouble spots

While the filter causes most problems, two other areas commonly harbour odour-causing debris.

Spray arm bearings can trap small food particles like rice or pasta fragments. These sit in water that pools between cycles, creating stagnant pockets that standard washes miss. The resulting smell is often reminiscent of pond water.

Door seals present another challenge. The rubber gasket’s folds trap moisture and residue, creating ideal conditions for mould and bacterial growth. This is particularly problematic with low-temperature washes or liquid detergents, which can leave more residue than powders. A quick wipe of the visible surface helps, but deeper creases need proper attention.

The pattern is consistent: odours stem from debris trapped where water flow is restricted, not from general surface contamination.

Don’t overlook the salt compartment

Your dishwasher’s salt reservoir might seem an unlikely culprit, but it can hold stagnant water if drainage is imperfect. This standing water develops a distinct eggy smell over time. Since it’s sealed beneath a lid, normal cleaning cycles won’t necessarily reach it.

Check this compartment if odours persist after filter cleaning. Remove the drawer, wipe around the lid, and inspect for discoloured water. Even without noticeable smells, periodic cleaning prevents future issues. Learn more about proper maintenance in our dishwasher salt guide .

Creating your maintenance routine

Your approach should match your usage patterns and tolerance for odours.

For immediate odour elimination: Thoroughly clean the filter, check the salt compartment, and run an empty cycle at high temperature. This three-part approach targets the primary mechanical sources directly.

Regular maintenance for frequent users: Check the filter weekly and use a commercial cleaner monthly. The cleaner addresses limescale and residue in spray arms and heating elements, while filter maintenance prevents debris accumulation.

Budget-friendly option: Weekly filter checks combined with empty hot washes every four to six weeks can effectively control odours without additional products. Consistency is key—skipping sessions allows smells to return.

The common element across all approaches remains filter maintenance. Other steps provide valuable support, but keeping the filter clear is non-negotiable.

When to consider cleaning products

If you decide commercial cleaners would benefit your maintenance routine, here’s how to evaluate options.

Finish Dishwasher Cleaner (paid link) is widely available and formulated to remove limescale and grease while freshening the machine. Multi-packs offer better value for regular use. It works best as preventive maintenance rather than a solution for severely neglected machines. Compare options in our dishwasher cleaner comparison .

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Dr. Beckmann Service-it (paid link) targets musty odours with a simple empty-cycle treatment. The per-use cost is higher than some alternatives, and stubborn odours might require multiple treatments. For budget-conscious households, a thorough filter and spray arm cleaning followed by a hot empty cycle often achieves similar results.

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Supermarket own-brand cleaners provide budget alternatives, though formulations may be less specialised than dedicated brands. They can suffice for well-maintained machines needing occasional boosts, but significant limescale or persistent odours may warrant investment in specialised products.

Preventing recurring odours

Stopping smells from returning requires addressing the conditions that cause them.

Scrape plates before loading—you needn’t pre-wash, but removing large food scraps reduces filter blockages. Rice, pasta and bread particles are particularly problematic.

Handle egg-contaminated items carefully—egg protein creates distinctive, persistent odours when breaking down in warm, moist environments. Rinse egg-covered plates before loading or wash them by hand.

Regular empty cycles—running a hot wash without dishes every four to six weeks flushes residual debris and maintains drain line clarity, as manufacturers recommend.

Improve air circulation—leaving the door slightly ajar between cycles prevents the sealed, damp environment where bacteria and mould thrive. If safety concerns prevent fully opening, using the latch position still helps.

For a structured maintenance schedule covering all these elements, our free appliance care checklist provides specific sequences for filter, salt drawer, and spray arm maintenance.

Understanding smell sources

Common questions answered

What causes rotten egg smells?

Food debris trapped in the filter, stagnant water in the salt compartment, or particles in spray arm bearings are the usual suspects. Egg dishes are particularly problematic—the protein breakdown creates distinctive odours. Maintenance washes alone won’t solve these issues without manual cleaning of the affected areas.

Are empty cycles sufficient?

Hot empty washes help maintain freshness when used periodically. However, if the filter is blocked or spray arms contain debris, the cycle may simply circulate existing odours. Always clean the filter and check the salt compartment before running maintenance cycles.

Do cleaner tablets provide value?

They’re useful for daily users, addressing limescale and residue in components that filter cleaning alone doesn’t reach. For existing odours, though, start with manual cleaning of the filter and salt drawer before investing in cleaners. These products work better as preventive measures than rescue treatments.

Filter maintenance remains the cornerstone of odour prevention. Cleaners, empty cycles, and ventilation habits provide valuable support, but none substitute for keeping the filter clear. This simple, cost-free weekly task resolves most odour issues. Commercial cleaners become worthwhile additions once you’ve established consistent filter maintenance.

Our free appliance care checklist helps maintain long-term freshness by organising all necessary maintenance tasks.

Now that you understand where dishwasher smells originate, you have two practical paths forward: our detailed cleaning guide for immediate action, or our prevention-focused hub for understanding why odours recur.

Further reading

• How to Clean a Dishwasher: Filter, Spray Arms and Drain
• Dishwasher Not Cleaning Properly? Check These Five Things
• Why Is My Dishwasher Leaving White Film or Grit on Glasses?
• Dishwasher Salt, Rinse Aid and Tablets: What Each Does

Reference sources

2. Bosch Home Appliances
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Note: General guidance only, verify details with a qualified professional or official source.